Top IPC subclasses
1
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F03D
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3
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Wind motors
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2
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F24J
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1
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Production or use of heat not otherwise provided for
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3
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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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4
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F03G
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1
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spring, weight, inertia, or like motorsmechanical-power-producing devices or mechanisms, not otherwi
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