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Patents > Inventor country : BE or DE & IPCs : IPC B64C23/00 or IPC B64C31/06

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airplane (12) · stability (9) · propeller (9) · frame (8) · hybrid (6) · construction (5) · takeoff (5) · kite (5) · gyroscope (4) · whole (4) · propulsion (4) · propellers (4) · design (4) · navigation (4) · lift (3) · None (3) · chassis (3) · kites (3)
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Showing below up to 32 results in range #1 to #32.

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