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A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONSTRANSPORTING
C
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CHEMISTRYMETALLURGY
D
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TEXTILESPAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
F01
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ENGINES OR PUMPS
F01
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MACHINES OR ENGINES IN GENERALENGINE PLANTS IN GENERALSTEAM ENGINES
F02
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COMBUSTION ENGINESHOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
F02B
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INTERNAL-COMBUSTION PISTON ENGINESCOMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
F02C
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GAS-TURBINE PLANTSAIR INTAKES FOR JET-PROPULSION PLANTSCONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; combustion apparatus in which combustion takes place in a fluidised bed of fuel or other particles F23C 10/00; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B 11/00)
F02D
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CONTROLLING COMBUSTION ENGINES  (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K 31/00;  conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) [4, 2006.01]
F02F
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CYLINDERS, PISTONS, OR CASINGS FOR COMBUSTION ENGINESARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES [2]
F02G
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HOT-GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K)USE OF WASTE HEAT OF COMBUSTION ENGINES, NOT OTHERWISE PROVIDED FOR
F02K
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JET-PROPULSION PLANTS (arrangement or mounting of jet-propulsion plants in land vehicles or vehicles in general B60K; arrangement or mounting of jet-propulsion plants in waterborne vessels B63H; controlling aircraft attitude, flight direction or altitude by jet reaction B64C 15/00, B64U 50/10; arrangement or mounting of jet-propulsion plants in aircraft B64D 27/00, B64U 50/10; plants characterised by the power of the working fluid being divided between jet propulsion and another form of propulsion, e.g. propeller, F02B, F02C; features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C)
F02M
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SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
F02N
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STARTING OF COMBUSTION ENGINESSTARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
F02P
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IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINESTESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES (specially adapted for rotary-piston or oscillating-piston engines F02B 53/12; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general, see section H; sparking plugs H01T)
F02P 1/00
Electric spark ignition installations characterised by the type of ignition power generation or storage
F02P 1/00
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Installations having electric ignition energy generated by magneto- or dynamo-electric generators without subsequent storage [1, 2006.01]
F02P 3/00
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Other electric spark ignition installations characterised by the type of ignition power generation storage [1, 2006.01]
F02P 5/00
Advancing or retarding electric ignition sparkArrangements of distributors or of circuit-makers or -breakers for electric spark ignitionElectric spark ignition control or safety means, not otherwise provided for
F02P 5/00
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Advancing or retarding electric ignition sparkControl therefor [1, 6, 2006.01]
F02P 7/00
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Arrangement of distributors, circuit-makers, circuit-breakers or pick-up devices for electric spark ignition (advancing or retarding ignition or control therefor F02P 5/00; such devices per se, see the relevant classes of section H, e.g. rotary switches H01H 19/00, contact-breakers, distributors H01R 39/00, generators H02K) [1, 2006.01]
F02P 9/00
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Electric spark ignition control, not otherwise provided for [1, 2006.01]
F02P 11/00
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Safety means for electric spark ignition, not otherwise provided for [1, 2006.01]
F02P 13/00

F02P 13/00
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Sparking plugs structurally combined with other parts of internal-combustion engines (with fuel injectors F02M 57/06) [1, 2006.01]
F02P 15/00
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Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P 1/00-F02P 13/00 [1, 2006.01]
F02P 17/00
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Testing of ignition installations, e.g. in combination with adjusting (testing fuel injection apparatus F02M 65/00; testing ignition installations in general F23Q 23/00)Testing of ignition timing in compression-ignition engines [1, 4, 2006.01]
F02P 17/02
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Checking or adjusting ignition timing [6, 2006.01]
F02P 17/04
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. . dynamically [6, 2006.01]
F02P 17/06
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. . . using a stroboscopic lamp [6, 2006.01]
F02P 17/08
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. . . using a cathode-ray oscilloscope (F02P 17/06 takes precedence) [6, 2006.01]
F02P 17/10
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Measuring dwell or antidwell time [6, 2006.01]
F02P 17/12
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Testing characteristics of the spark, ignition voltage or current [6, 2006.01]
F02P 19/00
Other ignition
F02P 19/00
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Incandescent ignition, e.g. during starting of internal-combustion enginesCombination of incandescent and spark ignition [1, 4, 2006.01]
F02P 21/00
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Direct use of flames or burners for ignition [1, 2006.01]
F02P 23/00
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Other ignition [1, 2006.01]
F03
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MACHINES OR ENGINES FOR LIQUIDSWIND, 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
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
F17
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STORING OR DISTRIBUTING GASES OR LIQUIDS
F21
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LIGHTINGHEATING
F21
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LIGHTING
F22
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STEAM GENERATION
F23
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COMBUSTION APPARATUSCOMBUSTION PROCESSES
F24
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HEATINGRANGESVENTILATING
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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FURNACESKILNS, OVENS OR RETORTS [4]
F28
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HEAT EXCHANGE IN GENERAL
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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PHYSICS
H
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ELECTRICITY

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