Top IPC subclasses
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1
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F01N
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9
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gas-flow silencers or exhaust apparatus for machines or engines in generalgas-flow silencers or exha
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2
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F01L
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4
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cyclically operating valves for machines or engines
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3
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H02J
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2
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circuit arrangements or systems for supplying or distributing electric powersystems for storing elec
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4
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F02B
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1
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Internal-combustion piston engines; combustion engines in general
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5
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H02M
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1
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apparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use wit
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6
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B60K
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1
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arrangement or mounting of propulsion units or of transmissions in vehiclesarrangement or mounting o
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7
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B60L
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1
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electric equipment or propulsion of electrically-propelled vehiclesmagnetic suspension or levitation
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8
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B60W
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1
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conjoint control of vehicle sub-units of different type or different functioncontrol systems special
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9
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H02P
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1
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control or regulation of electric motors, generators, or dynamo-electric converterscontrolling trans
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