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Patents > CPCs : CPC B64C23/005 or None & Number of figures: 19-30

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design (15) · airplane (15) · stability (14) · frame (13) · Whole (10) · propulsion (9) · propellers (8) · navigation (7) · wings (6) · aerodynamics (6) · flapping (5) · propeller (5) · construction (5) · LTA (5) · compartments (4) · parachutes (4) · safety (3) · HTA (3) · marine (3)
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