Chargers for mobile phones; data cables; Headsets for mobile telephones; Laptop bags; Power banks; Smart watches; Straps for cellular phones; Video projectors; Accumulators, electric; Audio speakers; Computer peripheral devices; Covers for smartphones; Electric plugs; Electric wires and cables; Eyeglasses; Holders adapted for mobile phones; Protective films adapted for smartphones; Selfie sticks; Cases especially made for photographic apparatus and instruments; Theft prevention installations, electric.

Common metals and their alloys; Metal building materials; Transportable buildings of metal; Materials of metal for railway tracks; Non-electric cables and wires of common metal; Ironmongery, small items of metal hardware; Pipes and tubes of metal; Safes; Goods of common metal not included in other classes; Ores; Steel, unwrought or semi-wrought; Firedogs [andirons]; Aluminium; Anchors; Copper rings; Rings of metal; Rings of common metal for keys; Angle irons; Lintels of metal; Reels of metal, non-mechanical, for flexible hoses; German silver; Door cases of metal; Reinforcing materials, of metal, for concrete; Reinforcing materials of metal for machine belts; Reinforcing materials of metal for pipes; Fittings of metal for compressed air ducts; Reinforcing materials of metal for building; Laths of metal; Masts of metal; Winding spools of metal, non-mechanical, for flexible hoses; Rods of metal for brazing and welding; Brazing (Rods of metal for -); Welding (Rods of metal for -); Bird baths [structures of metal]; Swimming pools [metal structures]; Floating docks of metal for mooring boats; Platforms, prefabricated, of metal; Strap-hinges of metal; Wind vanes of metal; Barrels of metal; Door knockers; Jets of metal; Beryllium [glucinium]; Beak-irons [bick-irons]; Armour plating; Beacons of metal, non-luminous; Nozzles of metal; Buckles of common metal [hardware]; Bottles [metal containers] for compressed gas or liquid air; Identification bracelets of metal, for hospitals; Slings of metal for handling loads; Braces of metal for handling loads; Bronzes [works of art]; Bronze; Bronzes for tombstones; Busts of common metal; Cabanas of metal; Paint spraying booths, of metal; Telephone boxes of metal; Cadmium; Chimneys of metal; Bells; Door bells, non-electric; Grilles of metal; Turnstiles; Chimney shafts of metal; Chimney cowls of metal; Sealing caps of metal; Bottle caps of metal; Safes; Bins of metal; Casings of metal for oilwells; Shuttering of metal for concrete; Safety cashboxes; Cashboxes of metal; Letter boxes of metal; Tool boxes of metal, empty; Tool chests of metal, empty; Bolts (Lock -); Safety chains of metal; Chains of metal; Cattle chains; Cables of metal, non-electric; Telpher cables; Eye bolts; Celtium [hafnium]; Wheel clamps [boots]; Barrel hoops of metal; Cermets; Hinges of metal; Cotter pins of metal; Keys; Bolts (Door -) of metal; Ironmongery; Nails; Pitons of metal [mountaineering equipment]; Crampons [climbing irons]; Closures of metal for containers; Bottle closures of metal; Door closers, non-electric; Locks of metal for bags; Box fasteners of metal; Belts of metal for handling loads; Cobalt, raw; Bungs of metal; Wall hooks of metal for pipes; Manifolds of metal for pipelines; Pillars of metal for buildings; Advertisement columns of metal; Chill-molds [foundry]; Water-pipes of metal; Penstock pipes of metal; Ducts of metal, for central heating installations; Ducts of metal for ventilating and air conditioning installations; Floating containers of metal; Containers of metal [storage, transport]; Flashing of metal, for building; Roof flashing of metal; Manhole covers of metal; Roof coverings of metal; Roofing of metal; Armour plate; Ropes of metal; Cornices of metal; Steel buildings; Buildings of metal; Transportable buildings of metal; Pot hooks of metal; Window casement bolts; Vaults of metal [burial]; Chromium; Nuts of metal; Meat safes of metal; Wind-driven bird-repelling devices made of metal; Door openers, non-electric; Towel dispensers, fixed, of metal; Window stops of metal; Door stops of metal; Tinplate; Chrome iron; Iron, unwrought or semi-wrought; Iron (Molybdenum -); Silicon iron; Ferrotitanium; Tungsten iron; Steel wire; Aluminium wire; Copper wire, not insulated; Wire of common metal alloys, except fuse wire; Wire of common metal; Thread of metal for tying-up purposes; Soldering wire of metal; Iron wire; Barbed wire; Windows of metal; Casement windows of metal; Aluminium foil; Tinfoil; Foils of metal for wrapping and packaging; Animals (Metal cages for wild -); Galena [ore]; Machine belt fasteners of metal; Hooks for slate [metal hardware]; Hooks of metal for clothes rails; Mooring buoys of metal; Germanium; Cast steel; Wire rope; Ferrules of metal; Ferrules of metal for handles; Cast iron, unwrought or semi-wrought; Cable joints of metal, non-electric; Rope thimbles of metal; Elbows of metal for pipes; Stair treads [steps] of metal; Duckboards of metal; Gutters of metal; Guard rails of metal; Fittings of metal for windows; Fittings of metal for beds; Fittings of metal for furniture; Door fittings, of metal; Building or furniture fittings of nickel-silver; Ironwork for windows; Ironwork for doors; Fittings of metal for building; Fittings of metal for coffins; Crash barriers of metal for roads; Tinplate packings; Scaffolding of metal; Cask stands of metal; Shutters of metal; Enclosures of metal for tombs; Anvils; Indium; Signboards of metal; Bicycle parking installations of metal; Sheets and plates of metal; Steel sheets; Tombstones of metal; Floor tiles, of metal; Paving blocks of metal; Nickel-silver; Silver plated tin alloy; Bindings of metal; Binding thread of metal for agricultural purposes; Sheaf binders of metal; Steel alloys; Alloys of common metal; Brazing alloys; Letters and numerals of common metal, except type; Filings of metal; Limonite; Ingots of common metal; Padlocks; Magnesium; Handcuffs; Manganese; Knife handles of metal; Scythe handles of metal; Broom handles of metal; Tool handles of metal; Sleeves [metal hardware]; Pipe muffs of metal; Door handles of metal; Iron slabs; Blooms [metallurgy]; Materials of metal for funicular railway permanent ways; Railway material of metal; Building materials of metal; Refractory construction materials of metal; Tiles of metal for building; Brackets of metal for building; Common metals, unwrought or semi-wrought; Metals in powder form; Pyrophoric metals; Anti-friction metal; White metal; Chrome ores; Iron ores; Ores of metal; Chimney pots of metal; Moldings of metal for cornices; Hoop steel; Hoop iron; Molybdenum; Springs [metal hardware]; Stringers [parts of staircases] of metal; Tombs (Monuments of metal for -); Monuments of metal; Vice claws of metal; Vice benches of metal; Nickel; Niobium; House numbers of metal, non-luminous; Works of art of common metal; Brass, unwrought or semi-wrought; Bolts of metal; Pilings of metal; Transport pallets of metal; Handling pallets of metal; Loading pallets, of metal; Bolts, flat; Steel masts; Mooring bollards of metal; Posts of metal for electric lines; Posts of metal; Telegraph posts of metal; Palings of metal; Balls of steel; Baskets of metal; Door panels of metal; Signalling panels, non-luminous and non-mechanical, of metal; Building boards of metal; Furnace fireguards; Signs, non-luminous and non-mechanical, of metal, for roads; Stops of metal; Clothes hooks of metal; Skating rinks [structures of metal]; Tile floorings of metal; Floors of metal; Arbours [structures of metal]; Pegs of metal; Jalousies of metal; Poles of metal; Tie plates; Shims; Identity plates of metal; Turntables [railways]; Tent pegs of metal; Lead seals; Lead, unwrought or semi-wrought; Tombstone plaques of metal; Chicken-houses, of metal; Knobs of metal; Gates of metal; Doors of metal; Porches of metal [building]; Steps [ladders] of metal; Tree protectors of metal; Pulleys of metal, other than for machines; Ferrules of metal for walking sticks; Brads; Joists of metal; Grease nipples; Junctions of metal for pipes; Couplings of metal for chains; Copper, unwrought or semi-wrought; Rocket launching platforms of metal; Crampons of metal [cramps]; Horseshoe nails; Door scrapers; Fences of metal; Tanks of metal; Containers of metal for storing acids; Containers of metal for compressed gas or liquid air; Containers of metal for liquid fuel; Packaging containers of metal; Rivets of metal; Cladding of metal for construction and building; Wall claddings of metal [building]; Wall linings of metal [building]; Wainscotting of metal; Tubbing of metal; Washers of metal; Rails of metal; Bed casters of metal; Furniture casters of metal; Taps for casks, of metal; Sash pulleys; Runners of metal for sliding doors; Loading gauge rods, of metal, for railway wagons; Gold solder; Silver solder; Latches of metal; Latch bars of metal; Bars for metal railings; Ladders of metal; Staircases of metal; Boarding stairs of metal, mobile, for passengers; Railway points; Boxes of common metal; Tin cans; Furnace fire screens; Badges of metal for vehicles; Signs, non-luminous and non-mechanical, of metal; Binding screws of metal for cables; Spring locks; Locks of metal, other than electric; Locks of metal for vehicles; Greenhouses of metal, transportable; Silos of metal; Ceilings of metal; Sills of metal; Bells for animals; Props of metal; Flanges of metal [collars]; Window fasteners of metal; Spurs; Pins [hardware]; Tension links; Tin; Ice moulds of metal; Foundry molds [moulds] of metal; Statues of common metal; Statuettes of common metal; Fish plates [rails]; Tombstone stelae of metal; Wrapping or binding bands of metal; Framework of metal for building; Roller blinds of steel; Wall plugs of metal; Casks of metal; Tantalum [metal]; Memorial plates of metal; Numberplates, of metal; Anvils [portable]; Tiles of metal; Window frames of metal; Greenhouse frames of metal; Frames of metal for building; Outdoor blinds of metal; Wire stretchers [tension links]; Iron bands (Stretchers for -) [tension links]; Stretchers for metal bands [tension links]; Belt stretchers of metal; Wire cloth; Vats of metal; Titanium; Tombac; Tombs of metal; Trellis of metal; Partitions of metal; Hoppers of metal, non-mechanical; Diving boards of metal; Traps for wild animals; Railroad ties of metal; Girders of metal; Pipework of metal; Steel pipes; Branching pipes of metal; Gutter pipes of metal; Drain pipes of metal; Pipes and tubes of metal; Aviaries of metal [structures]; Hooks [metal hardware]; Water-pipe valves of metal; Drain traps [valves] of metal; Valves of metal, other than parts of machines; Vanadium; Troughs of metal for mixing mortar; Screws of metal; Tungsten; Clips of metal for cables and pipes; Insect screens of metal; Zinc; Zirconium.

Machines and machine tools; Motors and engines (except for land vehicles); Machine coupling and transmission components (except for land vehicles); Agricultural implements other than hand-operated; Incubators for eggs; Automatic vending machines; Igniting devices for internal combustion engines; Vacuum cleaner attachments for disseminating perfumes and disinfectants; Sheaf-binding machines; Aerocondensers; Air brushes for applying colour; Agitators; Crank shafts; Derricks; Axles for machines; Transmission shafts, other than for land vehicles; Feeding apparatus for engine boilers; Carburetter feeders; Alternators; Grease rings [parts of machines]; Piston segments; Ball rings for bearings; Washing apparatus; Handling apparatus for loading and unloading; Cleaning appliances utilizing steam; High pressure washers; Electric welding apparatus; Electric arc welding apparatus; Lifting apparatus; Vulcanisation apparatus; Bookbinding apparatus and machines for industrial purposes; Sealing plastics (Electrical apparatus for -) [packaging]; Food preparation machines, electromechanical; Beverage preparation machines, electromechanical; Elevating apparatus; Inking apparatus for printing machines; Aerated beverage-making machines; Electric arc cutting apparatus; Ore treating machines; Racket stringing machines; Mineral water making machines; Aerated water making apparatus; Acetylene cleaning apparatus; Welding apparatus, gas-operated; Soldering apparatus, electric; Beer (Apparatus for drawing up - under pressure); Can openers, electric; Ploughs; Turf removing ploughs; Spinning wheels; Winches; Net hauling machines [fishing]; Lifts, other than ski-lifts; Vacuum cleaners; Kick starters for motorcycles; Reels, mechanical, for flexible hoses; Rams [machines]; Beaters, electric; Connecting rods for machines, motors and engines; Tarring machines; Reels for weaving looms; Reeling apparatus, mechanical; Bulldozers; Capstans; Rotary steam presses, portable, for fabrics; Mangles; Steam engine boilers; Gear boxes other than for land vehicles; Sparking plugs for internal combustion engines; Glow plugs for Diesel engines; Flues for engine boilers; Soldering blow pipes, gas-operated; Cutting blow pipes, gas-operated; Carburetters; Carding machines; Slides for knitting machines; Crankcases for machines, motors and engines; Cartridges for filtering machines; Boxes for matrices [printing]; Driving chains other than for land vehicles; Transmission chains other than for land vehicles; Elevator chains [parts of machines]; Saw benches [parts of machines]; Control cables for machines, engines or motors; Centrifugal machines; Brake shoes other than for vehicles; Adhesive bands for pulleys; Shears, electric; Printing cylinders; Rolling mill cylinders; Cylinders for machines; Cylinders for motors and engines; Dynamo belts; Belts for machines; Fan belts for motors and engines; Lift belts; Belts for motors and engines; Hoods [parts of machines]; Boiler scale collectors (Machine -); Mud catchers and collectors [machines]; Manifold (Exhaust -) for engines; Knives for mowing machines; Knives, electric; Knives [parts of machines]; Cultivators [machines]; Pedal drives for sewing machines; Controls (Hydraulic -) for machines, motors and engines; Controls (Pneumatic -) for machines, motors and engines; Compressors [machines]; Compressors for refrigerators; Air condensers; Condensers [steam] parts of machines; Door closers, electric; Catalytic converters; Converters for steel works; Fuel conversion apparatus for internal combustion engines; Torque converters other than for land vehicles; Drilling heads [parts of machines]; Drilling bits [parts of machines]; Rack and pinion jacks; Stitching machines; Bending machines; Roller bearings; Ball-bearings; Brake pads other than for vehicles; Self-oiling bearings; Bearings [parts of machines]; Anti-friction pads for machines; Bearings for transmission shafts; De-aerators for feedwater; Corn husking machines; Reduction gears other than for land vehicles; Steam traps; Glaziers' diamonds [parts of machines]; Dynamos; Bicycle dynamos; Disintegrators; Steam/oil separators; Anti-pollution devices for motors and engines; Control mechanisms for machines, engines or motors; Lift operating apparatus; Door openers, electric; Curtain drawing devices, electrically operated; Hydraulic door openers and closers [parts of machines]; Air cushion devices for moving loads; Pneumatic door openers and closers [parts of machines]; Adhesive tape dispensers [machines]; Automatic vending machines; Fuel dispensing pumps for service stations; Dividing machines; Fuel economisers for motors and engines; Ejectors; Electrodes for welding machines; Elevators [lifts]; Agricultural elevators; Blenders, electric, for household purposes; Harrows; Spin driers [not heated]; Extractors for mines; Labellers [machines]; Harvesting machines; Nut-tapping machines; Filters [parts of machines or engines]; Filters for cleaning cooling air, for engines; Filter presses; Chisels for machines; Scissors, electric; Shoe lasts [parts of machines]; Crushing machines; Milling machines; Clutches other than for land vehicles; Mixers [machines]; Whisks, electric, for household purposes; Housings [parts of machines]; Aerators; Current generators; Generators of electricity; Universal joints [Cardan joints]; Shaft couplings [machines]; Couplings other than for land vehicles; Joints [parts of engines]; Embossing machines; Carriage aprons; Notchers [machine tools]; Cranes [lifting and hoisting apparatus]; Emergency power generators; Fittings for engine boilers; Card clothing [parts of carding machines]; Brake linings other than for vehicles; Guides for machines; Mixing machines; Concrete mixers [machines]; Kneading machines; Central vacuum cleaning installations; Condensing installations; Dust removing installations for cleaning purposes; Sifting installations; Dust exhausting installations for cleaning purposes; Stands for machines; Incubators for eggs; Gears, other than for land vehicles; Injectors for engines; Vehicle washing installations; Pneumatic tube conveyors; Saw blades [parts of machines]; Loom shafts; Chaff cutter blades; Blades [parts of machines]; Rolling mills; Soldering lamps; Thermic lances [machines]; Rinsing machines; Dishwashers; Washing machines; Coin-operated washing machines; Binding apparatus for hay; Gears for weaving looms; Smoothing presses; Lubricators [parts of machines]; Parquet wax-polishers, electric; Shoe polishers, electric; Slide rests [parts of machines]; Steam engines; Compressed air machines; Agricultural machines; Trash compacting machines; Kitchen machines, electric; Suction machines for industrial purposes; Drainage machines; Spinning machines; Foundry machines; Engines for boats; Wax-polishing (Machines and apparatus for -), electric; Polishing (Machines and apparatus for -) [electric]; Cleaning (Machines and apparatus for -), electric; Carpet shampooing (Machines and apparatus for -), electric; Welding machines, electric; Electromechanical machines for chemical industry; Driving motors other than for land vehicles; Cord making machines; Stamping machines; Sizing machines; Bicycle assembling machines; Wrapping machines; Beating machines; Brewing machines; Butter machines; Paper machines; Typecasting machines; Type-setting machines [printing]; Packing machines; Sewing machines; Heel-making machines; Bitumen making machines; Sorting machines for industry; Edible pastes (Machines for making -); Threading machines; Filtering machines; Electroplating machines; Grating machines for vegetables; Earth moving machines; Bottle capping machines; Engraving machines; Braiding machines; Sharpening machines; Stropping machines; Air suction machines; Packaging machines; Whitewashing machines; Papermaking machines; Flour mill machines; Machines for the textile industry; Sugar making machines; Road making machines; Railroad constructing machines; Mechanized livestock feeders; Lace making machines; Type-setting machines [photocomposition]; Painting machines; Rail-laying machines; Oil refining machines; Printing machines for use on sheet metal; Dyeing machines; Dairy machines; Washing machines [laundry]; Bottle washing machines; Knitting machines; Metalworking machines; Leather-working machines; Woodworking machines; Tobacco processing machines; Glass working machines; Stone working machines; Mineworking machines; Molding machines; Milking machines; Hemming machines; Bottle sealing machines; Puddling machines; Darning machines; Leather paring machines; Sausage machines; Weeding machines; Satinizing machines; Fleshing machines; Cigarette machines for industrial purposes; Sealing machines for industrial purposes; Blowing machines; Filling machines; Printing machines; Stereotype machines; Wringing machines for laundry; Bread cutting machines; Bottle stoppering machines; Shredders [machines] for industrial use; Winnowers; Galvanizing machines; Blowing engines; Typographic machines; Machine tools; Tedding machines; Pepper mills other than hand-operated; Millstones; Coffee grinders, other than hand-operated; Mills for household purposes, other than hand-operated; Power hammers; Igniting magnetos; Chucks [parts of machines]; Handling machines, automatic [manipulators]; Cranks [parts of machines]; Forge bellows; Paper feeders [printing]; Exhausts for motors and engines; Ditchers [ploughs]; Electric hammers; Hammers [parts of machines]; Pneumatic hammers; Jacks [machines]; Tilt hammers; Matrices for use in printing; Propulsion mechanisms other than for land vehicles; Transmissions, other than for land vehicles; Pump diaphragms; Reapers and binders; Reapers and threshers; Reapers; Grindstones [parts of machines]; Springs [parts of machines]; Hoists; Truck lifts; Paring machines; Motorized cultivators; Jet engines other than for land vehicles; Compressed air engines; Aeroplane engines; Motors for boats; Air cushion vehicles (Engines for -); Motors, other than for land vehicles; Motors, electric, other than for land vehicles; Hydraulic engines and motors; Aeronautical engines; Starters for motors and engines; Chain saws; Centrifugal mills; Mills [machines]; Belts for conveyors; Shuttles [parts of machines]; Shovels, mechanical; Drilling machines; Journals [parts of machines]; Planing machines; Glue guns, electric; Compressed air guns for the extrusion of mastics; Spray guns for paint; Guns [tools using explosives]; Plunger pistons; Pistons for cylinders; Pistons for engines; Pistons [parts of machines or engines]; Spraying machines; Sewage pulverizers; Compressed air pumps; Air pumps [garage installations]; Centrifugal pumps; Aerating pumps for aquaria; Self-regulating fuel pumps; Lubricating pumps; Pumps [machines]; Pumps [parts of machines, engines or motors]; Beer pumps; Pumps for heating installations; Vacuum pumps [machines]; Loading ramps; Roller bridges; Blade holders [parts of machines]; Drill chucks [parts of machines]; Holding devices for machine tools; Stuffing boxes [parts of machines]; Basket presses; Presses [machines for industrial purposes]; Fodder presses; Swaging machines; Printing presses; Typographic presses; Pulleys; Pulleys [parts of machines]; Punching machines; Punches for punching machines; Trimming machines; Radiators [cooling] for motors and engines; Automatic grapnels for marine purposes; Raking machines; Rakes for raking machines; Friezing machines; Feedwater regulators; Pressure regulators [parts of machines]; Speed governors for machines, engines and motors; Regulators [parts of machines]; Trueing machines; Riveting machines; Pressure reducers [parts of machines]; Bottle filling machines; Finishing machines; Water heaters [parts of machines]; Robots [machines]; Food processors, electric; Rotary printing presses; Machine wheelwork; Taps [parts of machines, engines or motors]; Road rollers; Printing rollers for machines; Machine wheels; Freewheels other than for land vehicles; Vacuum cleaner bags; Soldering irons, electric; Soldering irons, gas-operated; Peeling machines; Escalators; Heat exchangers [parts of machines]; Grease boxes [parts of machines]; Excavators; Bearing brackets for machines; Hangers [parts of machines]; Saws [machines]; Brake segments other than for vehicles; Sowers [machines]; Separators; Drain cocks; Cream/milk separators; Sieves [machines or parts of machines]; Cinder sifters [machines]; Grain separators; Stalk separators [machines]; Mufflers for motors and engines; Degreasers [machines]; Blowing machines for the compression, exhaustion and transport of gases; Fans for the compression, sucking and carrying of grain; Snow ploughs; Road sweeping machines [self-propelled]; Carbon brushes [electricity]; Dynamo brushes; Brushes, electrically operated; Brushes [parts of machines]; Reels [parts of machines]; Fruit presses, electric, for household purposes; Diggers [machines]; Die-stamping machines; Molds [parts of machines]; Stators [parts of machines]; Ironing machines; Agricultural implements other than hand-operated; Superchargers; Journal boxes [parts of machines]; Superheaters; Coalcutting machines; Drums [parts of machines]; Moving pavements [sidewalks]; Printing plates; Tables for machines; Looms; Spinning frames; Tambours for embroidery machines; Hosiery looms; Cylinder heads for engines; Tympans [parts of printing presses]; Gas-operated blow torches; Wine presses; Potters' wheels; Lathes [machine tools]; Drilling rigs, floating or non-floating; Lawnmowers [machines]; Clippers [machines]; Shearing machines for animals; Metal drawing machines; Hoppers [mechanical discharging]; Cutting machines; Drills (Electric hand -); Feeders [parts of machines]; Transmissions for machines; Conveyors [machines]; Belt conveyors; Pneumatic transporters; Threshing machines; Cutters [machines]; Meat mincers [machines]; Chaff cutters; Waste disposals; Grinders/crushers, electric, for household purposes; Mine borers; Vacuum cleaner hoses; Boiler tubes [parts of machines]; Wind turbines; Hydraulic turbines; Turbines other than for land vehicles; Turbocompressors; Tools [parts of machines]; Hand-held tools, other than hand-operated; Sifters; Clack valves [parts of machines]; Pressure valves [parts of machines]; Valves [parts of machines]; Expansion tanks [parts of machines]; Fans for motors and engines; Teat cups for milking machines; Vibrators [machines] for industrial use; Machine fly-wheels; Ploughshares; Churns.

Installations and structures of metal.

Agricultural, earthmoving, construction, oil and gas extraction and mining equipment; Fittings; Foundry machines; Machines and parts and components therefor; Machine tools; Oil refining machines; Aerators; Hydroelectric installations; Turbines; Engines, powertrains, and generic machine parts; Generators of electricity.

Electric motors, rotors and stators for electric motors; asynchronous motors; three-phase motors; servomotors; three-phase squirrel-cage induction motors; asynchronous squirrel-cage induction motors; standard motors for the economic use of washing machines, dishwashers, heating circulating pumps, high pressure pumps, oil and gas burners, lawnmowers, shredders, office machines and medical equipment; drive equipment with electric motors; drives for main spindles in machine tools; electric control devices for electric motors; all the aforementioned goods other than for land machines.

Frequency transformers.