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Patents > Inventor country: US & Number of text pages: 3-70 & Number of claims: None

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stability (9) · propeller (8) · frame (7) · airplane (7) · propulsion (6) · Helicopter (4) · None (3) · parachute (3) · airfoil (3) · kite (3) · Hybrid (3) · landing (3) · fabric (3) · balloon (3) · Wings (3)
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