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Patents > IPCs : IPC B64C23/00 or IPC F16F9/348 & Number of text pages: 4

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airplane (13) · Propulsion (8) · navigation (6) · propellers (6) · Hybrid (6) · stability (5) · design (5) · LTA (4) · None (4) · sustentation (4) · ascension (4) · construction (3) · takeoff (3) · propeller (3) · frame (3) · whole (3) · heavier-than-air (3) · lift (3) · helicopter (3)
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