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Patents > Office : BE or MX or Other & Grant date: 1900 - 1909 & CPCs: CPC B64C33/00

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flapping (11) · wings (8) · propulsion (7) · airplane (6) · stability (5) · hybrid (5) · navigation (5) · None (5) · ornithopter (5) · takeoff (3) · frame (3) · human-powered (3) · airfoil (3) · LTA (3) · descent (2) · wheels (2) · HTA (2) · lift (2)
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Showing below up to 31 results in range #1 to #31.

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