Top IPC subclasses
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1
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F02B
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50
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Internal-combustion piston engines; combustion engines in general
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2
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F01K
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10
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steam engine plantssteam accumulatorsengine plants not otherwise provided forengines using special w
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3
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E03C
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7
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domestic plumbing installations for fresh water or waste watersinks
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4
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E03D
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7
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water-closets or urinals with flushing devicesflushing valves therefor
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5
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F22B
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5
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methods of steam generationsteam boilers
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6
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E02D
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5
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foundationsexcavationsembankmentsunderground or underwater structures
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7
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A47K
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4
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sanitary equipment not otherwise provided fortoilet accessories
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8
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F16H
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3
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gearing
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9
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F01B
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3
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machines or engines, in general or of positive-displacement type, e.g. steam engines
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10
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B62M
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3
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rider propulsion of wheeled vehicles or sledgespowered propulsion of sledges or cyclestransmissions
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11
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E01F
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3
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additional work, such as equipping roads or the construction of platforms, helicopter landing stages
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12
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A61M
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3
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devices for introducing media into, or onto, the bodydevices for transducing body media or for takin
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13
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A01G
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3
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Horticulture; cultivation of vegetables, flowers, rice, fruit, vines, hops, or seaweed; forestry; watering
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14
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F03D
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2
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Wind motors
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15
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B26B
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2
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hand-held cutting tools not otherwise provided for
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16
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F01D
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2
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non-positive-displacement machines or engines, e.g. steam turbines
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17
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A45D
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2
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hairdressing or shaving equipmentmanicuring or other cosmetic treatment
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18
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F02M
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2
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supplying combustion engines in general with combustible mixtures or constituents thereof
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19
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A61H
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2
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physical therapy apparatus, e.g. devices for locating or stimulating reflex points in the bodyartifi
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20
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B64C
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1
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aeroplaneshelicopters
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