98 resultsfor "INENTEC"

waste treatment system consisting of partial oxidation chamber and gas handling equipment for gasifying organic matter

Cable junction sleeves of metal; Machine belt fasteners of metal; Metal bolts; Spring hinges of metal; Steel wire

Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air filtering installations; Air filters for air conditioners in vehicle passenger compartments; Air filters for air conditioning units; Air filters for domestic use; Apparatus for filtering drinking water; Fibrous filtering media for general industrial use in the purification of air and industrial fluids; Filters for air conditioning; Filters for drinking water; HEPA filters for household use; Water filtering apparatus; Water filters; Water filtration and purification units and replacement cartridges and filters therefor

Antifreeze; Surfactants for use in the manufacture of synthetic detergents; Non-ionic surfactants as raw materials for use in the manufacture of industrial products, consumer and household products; Cationic surfactants as raw materials for use in the manufacture of industrial products, consumer and household products; Photoresist for use in the manufacture of semiconductors; Chemical oxidants for use in the manufacture of printed circuits; Detergents for use in manufacturing processes; fluorine; argon; neon; xenon; krypton; industrial chemicals; propellant gases for aerosols; hydrofluoric acid; Auxiliary fluids for use with abrasives for general industrial use; Solidified protective gases for welding

TOXIC GAS NEUTRALIZERS; CHEMICAL PREPARATIONS FOR THE PURIFICATION OF GAS; SOLIDIFIED GASES FOR INDUSTRIAL PURPOSE IN THE NATURE OF SOLIDIFIED PROTECTIVE GASES FOR WELDING; PROPELLANT GASES FOR AEROSOLS; HYDROGEN; ARGON; PROTECTIVE GASES FOR WELDING; INDUSTRIAL CHEMICALS; CHEMICAL PREPARATIONS FOR SCIENTIFIC PURPOSES, OTHER THAN FOR MEDICAL OR VETERINARY USE; SCIENTIFIC CHEMICALS; CHEMICAL PREPARATIONS IN THE NATURE OF FILTERING MATERIALS IN MEDIA CHEMICAL COMPOSITIONS FOR REMOVING UNWANTED GASES; ETCHANT FOR USE IN THE MANUFACTURE OF SEMICONDUCTORS; ANTI-FOULING AGENT, NAMELY, CHEMICAL AGENT FOR CHELATING AND SEQUESTERING; SILICON NITRIDE BEING CHEMICAL PREPARATIONS FOR GENERAL INDUSTRIAL MANUFACTURING; FLUORINE

Modular LED display panels; Electronic displays, namely, digital signage for use in providing automotive drivers with operational information; Light emitting diode (LED) displays; Micro light emitting diode (Micro-LED) displays; Electroluminescent display panels; Light emitting diodes (LEDs); Micro light emitting diodes (Micro-LEDs); Semiconductor wafers; Semiconductor chips; Micro semiconductor devices; Micro-LED modules, an assembly of Micro-LEDs, for use in lighting or displays; Modular Micro-LED display panels; Supersized television apparatus, namely, large screen televisions

Magazines, printed periodicals and books featuring computer, computer games, global communications network resources, travel, entertainment, news, stories and/or literature, foreign language learning; stickers; boxes of paper; notebooks; manuals and handbooks in the field of computer program instruction and foreign language learning instruction; greeting cards and invitation cards; bags and pouches of paper or plastics for packaging; bubble packs for wrapping or packaging; writing materials, namely, pens and pencils | Custom manufacture of computer peripheral equipment; manufacture to order and/or specification of others of cordless telephone, cell phones, and PDA; manufacture to order and/or specification of others of television, liquid-crystal display, and electrical appliances | Publication of books, magazines, literature; providing information relating to entertainment, namely, music, films, television programs, and education via a global computer network; entertainment services, namely, providing a web site featuring music, animation, and movies on the Internet; providing online electronic games services via computer or Internet or other communication; providing on-line non-downloadable books featuring computer, computer games, global communications network resources, travel, entertainment, news, stories and/or literature, foreign language learning

Chemicals for use in industry and science; fire extinguishing compositions; tempering preparations for electronic assembly, welding preparations for electronic assembly, namely, chemicals for welding, welding gases and metal welding fluxes; brazing chemicals for electronic assembly; metal welding fluxes; adhesives for industrial use; solvent for foam expansion, namely, solvent type processing compositions for use in the electronics industry; liquefied gas, namely, propellant gases for aerosols; gas and preparations for water treatment, namely, chemicals for the treatment of water and wastewater; chemical preparations, namely, cleaning solvents and detergents for industrial use for precision cleaning of industrial parts | Preparations for the protection of materials and surfaces, namely, protective varnish, protective lacquers | Common metals and their alloys for welding; non-electrical metal cables and wires for welding; steel or aluminium casings designed to contain gas | Treatment of materials and surfaces, namely, heat treatment and coating of industrial parts by means of solvent evaporation and polymerization; recycling of used products; regeneration services in the nature of recycling of used industrial and electronic parts; destruction of used products, namely, destruction of waste and trash | Engineering services, consultation and assessment in the field of chemicals, namely, consulting in the field of engineering relating to collection and recycling systems for gas wastes and chemical compounds, and engineering issues related to the storage and supply of gasses and liquids

maintenance and repair services in the field of electronic dictionaries, electronic notebooks, electronic games, electronic game cassettes, electronic education machines, IC cards (Integrated Circuit cards), memory cards, calculators, data processing machines, wordprocessors, computers, computer terminal apparatus, computer peripheral apparatus, computer accessory apparatus, disk drivers, disks, CD-ROM, mouse, image scanners, light pens, writing input recognition apparatus, computer software, printers, interface cards, sound blaster cards, micro-processor chips, recording, transmitting and reproducing apparatus for sound and image, telephone sets, pagers, facsimile machines, modems, mobile telephones, cellular telephones, cordless telephones, telephone answering machines, image telephones, radio-frequency modulators, communication apparatus and computer peripherals products * thereof *; export and import agencies for electronic dictionaries, electronic notebooks, electronic educational machines, integrated circuit cards, memory cards, calculators, data processing machines, wordprocessors, computers, computer terminals, computer peripherals, computer accessories, disc drives, discs, CD-ROMs, mice, image scanners, light pens, writing input recognition apparatuses, computer software, printers, interface cards, sound blaster cards, microprocessor chips, recording, transmitting and reproducing apparatuses for sound and images; telephone sets, pagers, facsimile machines, modems, mobile telephones, cellular telephones, cordless telephones, telephone answering machines, video telephones, radio-frequency modulators, communication apparatuses, computer peripherals, and business consultation services in the aforementioned fields; inspections of electronic equipment in the field of electronic dictionaries, electronic notebooks, electronic games, electronic game cassettes, electronic education machines, IC cards (Integrated Circuit cards), memory cards, calculators, data processing machines, wordprocessors, computers, computer terminal apparatus, computer peripheral apparatus, computer accessory apparatus, disk drivers, disks, CD-ROM, mouse, image scanners, light pens, writing input recognition apparatus, computer software, printers, interface cards, sound blaster cards, micro-processor chips, recording, transmitting and reproducing apparatus for sound and image, telephone sets, pagers, facsimile machines, modems, mobile telephones, cellular telephones, cordless telephones, telephone answering machines, image telephones, radio-frequency modulators, communication apparatus and computer peripherals products therefor

electronic dictionaries; electronic notebooks; integrated circuit cards; memory cards; calculators; data processing machines; wordprocessors; computers; computer terminals; computer peripherals; disc drives; CD-ROM drives; hard discs for computers; blank discs for computers; optical discs; audio discs featuring music; CD-ROM discs for computers featuring computer instructions; mouse; image scanners; light pens; writing input recognition apparatus; computer software for data base management, word processing, and spreadsheets; computer printers; computer interface cards; microprocessor chips; telephone sets; pagers; facsimile machines; modems; mobile telephones; cellular telephones; cordless telephones; telephone answering machines; video telephones; radio-frequency modulators; communication apparatus, namely radio receivers; and computer peripherals | hand-held electronic games and electronic game cassettes

Apparatus and instruments for conducting, switching, transforming, storing, regulating and controlling electricity; data processing apparatus and computers; fire extinguishing apparatus; measuring, weighing, monitoring, signalling, controlling, rescuing, steering and regulating apparatus and devices for with the operation of drilling devices and installations for the exploration, mining, extraction and for the transportation of fossil fuels, in particular crude oil and natural gas, and structural parts of such installations; scientific devices for the operation of drilling technology and installations for the exploration, mining, extraction and for the transportation of fossil fuels for use in particular crude oil and natural gas, and structural parts of such installations; motors other than for land vehicles; clutches for machines; power transmission belts for machines; machines for the exploration, mining, extraction and for the transportation of fossil fuels, in particular crude oil and natural gas, and structural parts therefor; drilling rigs with derrick, hoisting apparatus and motorized drive for drill holes on land and at sea; conveying machines with drive power units or motors, conveyor belts, material transport blowers or worm conveyors; mechanical equipment being structural parts for the aforementioned machines, sold as a component of said machines, namely, power units and devices, masts, mechanical hoisting devices, hoists and hoisting apparatus, motorized drives, transmissions, pumps, slush pumps, sieves, vibrating sieves, compressors, shut-off devices, shut-off devices in the nature of preventers, devices for mounting and for handling drill pipes, drill pipe magazines, rotating heads for drill pipes, rotating heads for drill pipes in the nature of top drives, tubing machines, swivels and turn-tables; conveying machines, and apparatus and devices in the nature of conveyors for the conveying of drilled material and drilling residues for use in the oil and gas industry; high-pressure pumps, for conveying drilled material and drilling residues, in particular plunger pumps and piston pumps and structural parts therefor; structural parts of the aforementioned devices and machines, all for drilling technology; Building construction; installation and repair services for machines and installations for use in the exploration, mining, extraction and transportation of fossil fuels, in particular crude oil and natural gas, and parts of such installations; project management services for others for business purposes rendered by a business economist for project management and project controlling in the oil and gas industry; Lighting installations, heating installations, namely, industrial apparatus for recovering heat or energy for heating parts of drilling plants for deep-hole drilling, cooling installations for water, drying installations, namely, industrial apparatus for de-humidifying gas in drilling plants, and ventilation installations, namely, electric fans, ventilators and blowers for use in drilling plants for deep-hole drilling; Scientific and technological services, namely, research and design in the field of oil and gas exploration; industrial analysis and research services in the field of oil and gas exploration; design and development of computer hardware and software; technological research and consultation on building construction for drilling devices as well as for installations for the exploration, mining, extraction and for the transportation of fossil fuels, in particular crude oil and natural gas, and parts of such installations; scientific research services and engineering services in connection with the exploration and the mining of fossil fuels, in particular crude oil and natural gas; engineering services in connection with project management and project controlling in the oil and gas exploration field; development of computer hardware and computer software for all aforementioned services; development of computer hardware and computer software for controlling drilling devices as well as for installations for the exploration, mining, extraction and for the transportation of fossil fuels, in particular crude oil and natural gas, and parts of such installations; scientific research services and engineering services in connection with the creation, the putting into operation, the operation and the maintenance and repair of installations for the exploration, mining, extraction and for the transportation of fossil fuels, in particular crude oil and natural gas, and parts of such installations

shower doors and tub enclosures

electrical, electrotechnical and electronic apparatus and instruments for measuring, regulating, signalling, checking, controlling, setting and monitoring various apparatus, equipment and systems for gas and liquids, namely, calculators, transmitters, controllers, terminals and data processors for laboratory analysis of beverages and liquids, for process analysis, density measurement, measurement of the speed of sound, refraction measurement, carbon dioxide and oxygen measurement, color measurement, pH measurement, conductivity measurement and yeast measurement in beverages and liquids; data processors, computer peripherals and computer programs all for laboratory analysis of beverages and liquids and for process analysis, density measurement, measurement of the speed of sound, refraction measurement, carbon dioxide measurement, oxygen measurement, turbidity, color measurement, pH measurement and conductivity measurement all with regard to beverages and liquids

Protective glasses; Protective industrial face shields | Face shields for medical use

Respirators other than for artificial respiration; cartridges and filters for respirators other than for artificial respiration; Distributorship services in the field of safety products and equipment

metal floor grates

FIRED HEATERS, HEAT RECOVERY UNITS, AND COMPONENTS FOR EACH

engineering grade thermoplastics in the form of pellets to be used in injection molding applications

Plastic in the form of bars, blocks, pellets, rods, sheets and tubes sold in bulk for use in manufacturing

On-line retail store services featuring household accessories

Coatstands; Cradles; Bottle racks; Closet accessories, namely, shoe racks; Clothes rods; Display stands; Drawer organizers; Free-standing tool racks; Hanging locker shelving made of fabric; Hat stands; Jewelry organizer displays in the nature of display stands and display boards for displaying and organizing jewelry; Metal display stands; Non-metal fabric hanging organizer; Non-metal hanging closet organizers for shoes, sweaters, purses, Sneakers and Home Accessories; Pot racks; Shelves for books; Shelves for storage; Storage and organization systems comprising shelves, drawers, cupboards, baskets and clothes rods, sold as a unit; Toy organizers comprised of shelves and removable storage bins sold as a unit; Umbrella stands; Wooden display stands

Addressing machines; Computer printer ink ribbons; Duplicating machines; Franking machines for office use; Ink ribbons; Postage meters for office use; Spools for inking ribbons; Typewriter ribbons; Typewriters, electric or non-electric

Engraving ink; Ink cartridges, filled, for printers and photocopiers; Ink for leather; Ink for photocopiers; Marking ink for animals; Photocopier toner; Printers' pastes; Printing ink; Toner cartridges, filled, for inkjet printers; Toner cartridges, filled, for laser printers; Toner cartridges, filled, for printers and photocopiers

Class 007: Water pumps for removing standing water from pools, ponds, and construction sites; electric generators; power washers, namely pressure washing machines; construction equipment namely, plate compactors; attachments for construction equipment, namely excavator grapples, excavator thumbs

Distributorships in the field of construction equipment, namely, excavator attachments and implements, such as hydraulic and manual excavator thumbs, hydraulic plate compactors, asphalt cutters, buckets, rakes, couplers, and replacement parts therefor

retail and distributorship services in the field of equipment and supplies for amateur still and video photography, and binoculars, telescopes, riflescopes and magnifiers

installation, repair, maintenance, reconditioning and servicing of water pumps, [ electric generators, ] power washers, construction equipment, namely, plate compactors, excavator grapples and excavator pumps and of parts for the service, maintenance, repair, reconditioning and general overhaul of the above; installation, repair, maintenance and servicing of parts, fittings or components for the above; rental and leasing of the above

Class 042: Providing temporary use of non-downloadable cloud-based software for listing and selling of products, equipment, components, and consumable products, and connecting enterprises with sales representatives or other service providers; software as a service (SAAS) services featuring software for sourcing and screening sales representatives or other service providers

Processed electrostatic dispersing thermoplastic compounds in pellet or powder form

Refinement of fuel materials; Gas production services; Processing of gas and oil; Recycling and waste treatment; Upcycling waste recycling; Recycling of waste and trash; Treatment of waste; Treatment and recycling of waste; Treatment reclamation of usable material from the waste residue of waste combustion and air pollution controls; Waste treatment services; Recycling of waste; Recovery of hydrocarbons from gas; Industrial containers and transportation and packaging articles of metal, namely, shipping containers; Containers of metal for storage and transport; Structures being housings and skids of metal, and transportable buildings of metal; Storage of energy and fuels; Fuels and illuminants, namely, oil for lighting; Fuel; Vaporized fuel mixtures, namely, gaseous fuel; Biofuels; Ethanol Fuel mixtures; Carburants, namely, fuel; Non-chemical fuel additives; Hydrogen fuel; Biomethane fuel; Paraffin; Benzene fuel; Fuel gas; Kerosene; Naphtha; Gasoline as fuel; Coal dust as fuel; Ethanol as fuel; Alcohol as fuel; Industrial Lubricants and industrial greases, waxes; Industrial oil; Industrial grease; Motor oil; Wax as raw material for hydrocarbon fuels; methanol fuel; Chemical substances, chemical materials and chemical preparations, and natural elements, namely synthetical hydrocarbons for industrial, scientific use; Chemicals for use in industry and science; Industrial chemicals for use in the manufacture of paints; Industrial chemicals for use in the manufacture of varnishes; Chemical preparations for use in industry for biotechnological purposes; Additives, chemical, to motor fuel; Aliphatic hydrocarbons; chemicals, namely, normal paraffin Hydrocarbon compounds, not including fuels; Hydrocarbon resins; Carbon; Methyl Benzol; Methyl Benzene; Ethyl alcohol; Benzoic acid; Benzene derivatives being benzene based acids; Carbonic acid gas; Carbon dioxide for industrial purposes; Chemical agents for carbon dioxide sequestration; Methane; Methanol being methyl alcohol for industrial purposes; Refined methanol for industrial purposes; Unprocessed plastics; Chemicals for use in the refining of liquid hydrocarbons; Chemicals for use in the treatment of liquid hydrocarbons; Synthetic resins, unprocessed; Unprocessed artificial resins for use in industry; Industrial treatment apparatus and installations, namely, for the processing of synthetic crude oil into synthetic hydrocarbons; Science and technology services, namely, research, development, testing, and evaluation of hydrocarbon production processes; Technological consulting services relating to manufacture of industrial chemicals; Technological consultancy in the fields of energy production and use; Technological consulting services in the field of alternative energy generation; Scientific research in the field of renewable energy; Conducting technical research and technical project studies relating to the use of natural energy; Research in the field of hydrogen fuel cells; Chemical research and analysis services; Development and test of chemical production methods; Engineering services in the field of energy technology

Xerographic toners; inks for large format printer; inks for desktop printers; paints; mimeographing ink; inks for digital printers; ink for photocopiers; toners for photocopiers; copying inks; inks for printing for use with office machines and equipment; inks for printing actual images; pigments; dyestuffs; synthetic ink for printing; printing ink; ink jet printer ink

Metal safes, namely, for the hotel industry

Bicycles; electric bicycles; motorcycles; motorcycle engines; engines for bicycles; wheels; structural parts of bicycles; structural parts for motorcycles; motors, electric, for land vehicles

Binding agents for foundry moulds and foundry shaped bodies, in particular with an inorganic base

Laboratory equipment, namely, microscopes; microscope accessories, namely, thermal microscope stage; temperature controller for materials to be researched; chucks for semiconductor wafer testing and materials, namely, structured semi-conductor wafers and crystalline semi-conductor material to be tested in the field of bioscience and material science; spectroscopes

insurance database applications software and manuals sold therewith

Weighing apparatus and instruments, namely, scales of all kinds, including precision scales; [ mass comparators; ] pressure, optical or electromagnetic power compensation sensors, namely, load sensing cells; electric metal-detecting equipment, namely, metal detectors; [ microscopes; apparatus for analysing gases; ] mechanical components specially adapted for scales and weighing apparatus, namely, stands, mounting brackets, ramps, pit frames, mounting kits for load cells, cable junction boxes, reject mechanisms, transportation belts, reject bins, pipe systems, and protection covers; electric and electronic components for scales and weighing installations, namely, data input, data display, data transfer, data reproduction, data storage and controlling devices in the nature of keyboards, flat panel display screens, wire and wireless electrical transmitters, electronic indicator boards and panels, electrical controllers, apparatus for transmitting and reproducing images, [ hard disk drives, ] central processing units for processing information, data or images, data processing apparatus, computer hardware, capacitors, electrical connectors, transformers, electrical switches, and electric cables; peripheral devices for weighing apparatus and instruments, scales, [ mass comparators, ] load sensing cells, measuring and supervision apparatus and electric metal-detecting equipment, namely, printers and data input, data display, data transfer, data reproduction, data storage and controlling devices in the nature of keyboards, flat panel display screens, wire and wireless electrical transmitters, electronic indicator boards and panels, electrical controllers, apparatus for transmitting and reproducing images, [ hard disk drives, ] data processing apparatus, computer hardware, printers, and scanners; parts specially adapted for all aforementioned goods, namely, stands, mounting brackets, ramps, pit frames, mounting kits for load cells, cable junction boxes, reject mechanisms, transportation belts, reject bins, pipe systems, protection covers, keyboards, flat panel display screens, wire and wireless electrical transmitters, indicators and controllers, apparatus for transmitting and reproducing images, hard disk drives, central processing units for processing information, data or images, data processing apparatus, computer hardware, capacitors, connectors, transformers, switches, and cables; software for controlling and documentation of manufacturing and packaging processes; software for controlling weighting apparatus and instruments, scales, mass comparators, load sensing cells, measuring and supervision apparatus and electric metal-detecting equipment; electrical cables, data transmission cables, and cable signal splitters for electric cables and data transmission cables, all being for weighing apparatus and instruments, scales, [ mass comparators, ] load sensing cells, measuring and supervision apparatus and electric metal-detecting equipment; electro-mechanical, optical and X-ray inspection apparatus for checking the weight, completeness, filling level, volume, form, dimensions and/or foreign bodies in products | Maintenance and repair of weighing apparatus and instruments, scales, mass comparators, load sensing cells, measuring and supervision apparatus and electric metal-detecting equipment | Education services, namely, provision of training and instruction in the field of industrial quality control, installations, maintenance and repair of weighing apparatus and instruments, scales, mass comparators, pressure sensors, namely, load sensing cells, electric metal-detecting equipment, namely, metal detectors, [ microscopes, apparatus for analyzing gases, ] mechanical, optical and X-ray inspection apparatus for checking the weight, completeness, filling level, volume, form, dimensions and/or foreign bodies in products, calibration of weighing apparatus and instruments, scales, [ mass comparators, ] pressure sensors, namely, load sensing cells, electric metal-detecting equipment, namely, metal detectors, microscopes, apparatus for analyzing gases, mechanical, optical and X-ray inspection apparatus for checking the weight, completeness, filling level, volume, form, dimensions and/or foreign bodies in products and in the field of business management training; arranging and conducting of seminars in the field of quality control, installation, maintenance, repair, and calibration of weighing apparatus and instruments, scales, [ mass comparators, ] pressure sensors, namely, load sensing cells, electric metal-detecting equipment, namely, metal detectors, [ microscopes, apparatus for analyzing gases, ] mechanical, optical and X-ray inspection apparatus for checking the weight, completeness, filling level, volume, form, dimensions and/or foreign bodies in products, and management training courses; conducting training and seminars for the pharmaceutical and chemical industry as well as for the food and beverage industry in the fields of quality systems and validation of products and procedures; all aforementioned services only in connection with the use of weighting apparatus and instruments, scales, [ mass comparators, ] load sensing cells, measuring and supervision apparatus and electric metal-detecting equipment | Calibration services in the control of inspection, measuring and test equipment, calibration of measuring devices; technical consultation services for manufacturers of pharmaceutical and chemical products as well as for food and beverage manufacturers in connection with auditing, namely, testing, analysis, and evaluation of the goods, installations and technical procedures of others to assure compliance with industry standards and guidelines; all aforementioned services only in connection with the use of weighting apparatus and instruments, scales, mass comparators, load sensing cells, measuring and supervision apparatus and electric metal-detecting equipment

Class 001: Chemicals for car bodies, sailing, industry, marble, wood and do it yourself (diy), namely, paste fillers for composite materials industry for automobile body repair, moulding compounds in the nature of Glaziers' putties for the composite materials industry for automobile body repair, tooling thermal pastes for composite materials industry, structural industrial adhesives, adhesive primers for use in roofing and chemical coatings for composite industry and the marine industry for the manufacture of camera lenses, biochemical catalysts, chemical auxiliaries in the nature of printing paste and color enhancer for printing textiles, unprocessed synthetic resins for industrial use, unprocessed artificial resins for use in moulds, tire sealing compounds, chemical preparations in the nature of diluents for industrial use, Glaziers' putties and other paste fillers for automobile body repair, and tire puncture sealants for the sealing of surfaces; all of the foregoing for automotive collision repair, marine maintenance, and consumer do it yourself use on marble and wood surfaces; Chemicals for car bodies, industry, marble, wood and diy, namely, chemical coatings for use in the manufacture of moulding compounds for the composite industry; none of the foregoing for use in the manufacture of steel or steel alloys; Class 002: Varnishes; primers; high solids primers; transparent coating compositions in the nature of paint; thinners for varnishes; diluents for vehicle refinishes, namely, thinners for varnishes; protective coatings in the form of sprays for use on metals, namely, anticorrosive coatings; protective products for use on metals, namely, protective surface coatings in the form of paints for metal; all of the foregoing for automotive body repair and refinish, marine maintenance, and consumer do it yourself use on marble and wood; none of the foregoing for use in the manufacture of steel or steel alloys

creation, design, development and maintenance of websites and websites that contain an online retail store for third parties

Blankets, electric, not for medical purposes; Electric fans for personal use; Electrically heated clothing; Electrically heated vests; Hair driers