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Patents > Inventor location : Birkenhead or Seine-et-Oise

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Airplane (15) · Stability (9) · Design (7) · wings (5) · Frame (5) · hybrid (5) · flapping (4) · Construction (4) · propellers (4) · helicopter (4) · ascension (4) · Automatic stability (3) · heavier-than-air (3) · Landing (3) · descent (3)
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