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Patents > Office: DE & IPCs : IPC B64C3/00 or IPC B64C39/00

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airplane (23) · frame (23) · construction (14) · wings (13) · design (12) · biplane (9) · fuselage (6) · None (6) · propeller (5) · subsystem (5) · Tragfläche (4) · propulsion (4) · Motors (3) · lift (3) · wing (3) · monoplane (3) · metal (3)
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