Drilldown: Patents

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Patents > National tech categories : DE 77h.6 or USPC 244/50 & Number of diagram pages: 1

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propeller (42) · propulsion (13) · Propellers (8) · subsystem (6) · helicopter (4) · airplane (4) · marine (4) · None (3) · metal (3) · wing (2) · stability (2) · safety (2) · parachute (2) · motor (2) · wood (2) · barometer (2) · electricity (2) · design (2) · aerodynamics (2)
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