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Patents > Office: FR & IPCs: IPC B64C39/00 & Number of text pages: 6-10

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Airplane (10) · propellers (5) · construction (5) · Wings (4) · frame (4) · motors (4) · design (4) · propulsion (3) · aerodynamics (3) · navigation (3) · sustentation (3) · stability (3) · lift (2) · hybrid (2) · HTA (2) · flapping (2) · None (2) · biplane (2)
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