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A
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SECTION A — HUMAN NECESSITIES
B
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SECTION B — PERFORMING OPERATIONSTRANSPORTING
C
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SECTION C — CHEMISTRYMETALLURGY
D
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SECTION D — TEXTILESPAPER
E
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SECTION E — FIXED CONSTRUCTIONS
F
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SECTION F — MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
F01
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ENGINES OR PUMPS
F01
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MACHINES OR ENGINES IN GENERAL (combustion engines F02; machines for liquids F03, F04)ENGINE PLANTS IN GENERALSTEAM ENGINES
F02
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COMBUSTION ENGINES (cyclically operating valves therefor, lubricating, exhausting, or silencing engines F01)HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
F03
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MACHINES OR ENGINES FOR LIQUIDS (for liquids and elastic fluids F01; positive-displacement machines for liquids F04)WIND, SPRING, OR WEIGHT MOTORSPRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
F04
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POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDSPUMPS FOR LIQUIDS OR ELASTIC FLUIDS (portable fire extinguishers with manually-operated pumps A62C 11/00, with power-driven pumps A62C 25/00; charging or scavenging combustion engines by pumps F02B; engine fuel-injection pumps F02M; ion pumps H01J 41/12; electrodynamic pumps H02K 44/02)
F15
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ENGINEERING IN GENERAL
F15
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FLUID-PRESSURE ACTUATORSHYDRAULICS OR PNEUMATICS IN GENERAL
F16
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ENGINEERING ELEMENTS OR UNITSGENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONSTHERMAL INSULATION IN GENERAL
F16B
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DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGESJOINTS OR JOINTING
F16C
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SHAFTSFLEXIBLE SHAFTSELEMENTS OF CRANKSHAFT MECHANISMSROTARY BODIES OTHER THAN GEARING ELEMENTSBEARINGS [5]
F16D
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COUPLINGS FOR TRANSMITTING ROTATIONCLUTCHESBRAKES [2]
F16F
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SPRINGSSHOCK-ABSORBERSMEANS FOR DAMPING VIBRATION
F16G
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BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSESCHAINSFITTINGS PREDOMINANTLY USED THEREFOR
F16H
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GEARING
F16H 1/00
Toothed gearings for conveying rotary motion
F16H 1/00
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Toothed gearings for conveying rotary motion (specific for conveying rotary motion with variable gear ratio or for reversing rotary motion F16H 3/00)
F16H 3/00
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Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion (speed-changing or reversing mechanisms F16H 59/00-F16H 63/00)
F16H 7/00
Gearing for conveying rotary motion by endless flexible members (flexible members, e.g. belts, chains per seF16G)
F16H 7/00
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Gearings for conveying rotary motion by endless flexible members (specific for conveying rotary motion with variable gear ratio or for reversing rotary motion F16H 9/00)
F16H 9/00
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Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members (control of change-speed or reversing-gearings conveying rotary motion F16H 59/00-F16H 63/00)
F16H 13/00
Other friction gearing for conveying rotary motion
F16H 13/00
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Gearing for conveying rotary motion with constant gear ratio by friction between rotary members (specific for conveying rotary motion with variable gear ratio or for reversing rotary motion F16H 15/00)
F16H 15/00
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Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members (control of change-speed or reversing-gearings conveying rotary motion F16H 59/00-F16H 63/00)
F16H 19/00

F16H 19/00
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Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion (with intermittently-driving members F16H 27/00-F16H 31/00; rope or like tackle for lifting or haulage B66D 3/00)
F16H 21/00
Gearing for conveying or converting motion by means of levers, links, or cams (combinations of gearings of different types F16H 37/00)
F16H 21/00
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Gearings comprising primarily only links or levers, with or without slides (F16H 23/00 takes precedence)
F16H 23/00
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Wobble-plate gearingsOblique-crank gearings
F16H 25/00
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Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
F16H 27/00
Gearings with intermittently-driving members
F16H 27/00
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Step-by-step mechanisms without freewheel members, e.g. Geneva drives (rotary gearings with cyclically-varying velocity ratio F16H 35/02; impulse couplings F16D 5/00; clockwork escapements G04B 15/00)
F16H 29/00
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Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action (freewheels F16D 41/00)
F16H 31/00
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Other gearings with freewheeling members or other intermittently-driving members (F16H 21/00, F16H 23/00, F16H 25/00 take precedence; gearings involving the use of automatic changing-mechanisms, e.g. cyclically-actuated reversal gearings, see the appropriate groups)
F16H 33/00

F16H 33/00
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Gearings based on repeated accumulation and delivery of energy
F16H 35/00
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Gearings or mechanisms with other special functional features
F16H 37/00
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Combinations of mechanical gearings, not hereinbefore provided for (applications of underdrives or overdrives in motor vehicles, combinations with differential gearings in motor vehicles B60K)
F16H 39/00
Fluid gearing (fluid actuators F15B; couplings or clutches with a fluid or semifluid as power-transmitting means F16D 31/00-F16D 39/00; fluid-resistance brakes F16D 57/00) [3]
F16H 39/00
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Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution (control of exclusively fluid gearing F16H 61/38; application to lifting or pushing equipment B66F) [5]
F16H 41/00
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Rotary fluid gearing of the hydrokinetic type (control of exclusively fluid gearing F16H 61/38) [5]
F16H 43/00
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Other fluid gearing, e.g. with oscillating input or output [2]
F16H 45/00
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Combinations of fluid gearings for conveying rotary motion with couplings or clutches (F16H 41/22 takes precedence; conjoint control of driveline clutches and change-speed gearing in vehicles B60W 10/02, B60W 10/10) [2]
F16H 45/02
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with mechanical clutches for bridging a fluid gearing of the hydrokinetic type (control of torque converter lock-up clutches F16H 61/14)
F16H 47/00
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Combinations of mechanical gearing with fluid clutches or fluid gearing (conjoint control of driveline clutches and change-speed gearing in vehicles B60W 10/02, B60W 10/10) [2]
F16H 48/00

F16H 48/00
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Differential gearings [6]
F16H 49/00
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Other gearing
F16H 51/00
Details of gearing or mechanisms (of screw-and-nut gearing F16H 25/00; of fluid gearing F16H 39/00-F16H 43/00; shafts, Bowden mechanisms, cranks, eccentrics, bearings, pivotal connections, crossheads, connecting-rods F16C; chains, belts F16G; piston-rods F16J 7/00)
F16H 51/00
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Levers (manipulating levers G05G)
F16H 53/00
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CamsNon-rotary camsCam-followers, e.g. rollers (cams specially adapted for reciprocating-piston liquid engines F03C 1/30)
F16H 55/00
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Elements with teeth or friction surfaces for conveying motionWormsPulleysSheaves (pulley-blocks for lifting or hauling appliances B66D 3/04) [4]
F16H 57/00
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General details of gearing
F16H 59/00
Control of gearing conveying rotary motion (orbital toothed gearings with a secondary drive in order to vary the speed continuously F16H 3/72; varying the speed ratio of driving or feeding mechanisms of machine tools B23Q 5/12, B23Q 5/46; conjoint control of drive units for vehicles B60W; cycle transmissions B62M; marine propulsion B63H) [5]
F16H 59/00
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Control inputs to change-speed- or reversing-gearings for conveying rotary motion [5]
F16H 61/00
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Control functions within change-speed- or reversing-gearings for conveying rotary motion [5]
F16H 63/00
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Control outputs to change-speed- or reversing-gearings for conveying rotary motion [5]
F16J
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PISTONSCYLINDERSPRESSURE VESSELS IN GENERALSEALINGS
F16K
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VALVESTAPSCOCKSACTUATING-FLOATSDEVICES FOR VENTING OR AERATING
F16L
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PIPESJOINTS OR FITTINGS FOR PIPESSUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBINGMEANS FOR THERMAL INSULATION IN GENERAL
F16M
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FRAMES, CASINGS, OR BEDS, OF ENGINES OR OTHER MACHINES OR APPARATUS, NOT SPECIFIC TO AN ENGINE, MACHINE, OR APPARATUS PROVIDED FOR ELSEWHERESTANDS OR SUPPORTS
F16N
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LUBRICATING
F16P
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SAFETY DEVICES IN GENERAL
F16S
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CONSTRUCTIONAL ELEMENTS IN GENERALSTRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
F16T
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STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
F17
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STORING OR DISTRIBUTING GASES OR LIQUIDS (water supply E03B)
F21
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LIGHTINGHEATING
F21
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LIGHTING (electric aspects or elements, see section H, e.g. electric light sources H01J, H01K, H05B)
F22
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STEAM GENERATION (chemical or physical apparatus for generating gases B01J; chemical generation of gas, e.g. under pressure, Section C; removal of combustion products or residues, e.g. cleaning of the combustion contaminated surfaces of tubes of boilers, F23J; generating combustion products of high pressure or high velocity F23R; water heaters not for steam generation F24H, F28; cleaning of internal or external surfaces of heat-transfer conduits, e.g. water tubes of boilers, F28G)
F23
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COMBUSTION APPARATUSCOMBUSTION PROCESSES
F24
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HEATINGRANGESVENTILATING (protecting plants by heating in gardens, orchards, or forests A01G 13/06; baking ovens and apparatus A21B; cooking devices other than ranges A47J; forging B21J, B21K; specially adapted for vehicles, see the relevant subclasses of classes B60-B64; combustion apparatus in general F23; drying F26B; ovens in general F27; electric heating elements or arrangements H05B)
F25
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REFRIGERATION OR COOLINGCOMBINED HEATING AND REFRIGERATION SYSTEMSHEAT PUMP SYSTEMSMANUFACTURE OR STORAGE OF ICELIQUEFACTION OR SOLIDIFICATION OF GASES
F26
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DRYING
F27
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FURNACESKILNSOVENSRETORTS (specially adapted for a purpose covered by a single other class and specifically mentioned in that class, see the class in question, e.g. bakery ovens A21B, glass melting furnaces C03B, coke or gas-making apparatus C10B, C10J, apparatus for cracking hydrocarbons C10G, blast furnaces C21B, converters for making steel C21C, furnaces for heat treatment of metal C21D; furnaces for electroslag or arc remelting of metals C22B 9/00; enamelling ovens C23D; combustion apparatus F23; electric heating H05B) [4]
F28
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HEAT EXCHANGE IN GENERAL (heat-transfer, heat-exchange or heat-storage materials C09K 5/00; arrangement or mounting of heat-exchangers in air-conditioning, air-humidification or ventilation F24F 13/30)
F41
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WEAPONSBLASTING
F41
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WEAPONS
F42
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AMMUNITIONBLASTING
F99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]
G
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SECTION G — PHYSICS
H
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SECTION H — ELECTRICITY

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