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Patents > Filing date: July 1912 & Number of text pages: 1-2

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airplane (17) · None (10) · stability (6) · Wings (6) · Design (5) · Gyroscope (4) · Aerodynamics (4) · navigation (3) · monoplane (3) · airfoil (2) · whole (2) · steering (2) · propulsion (2) · propellers (2) · ornithopter (2) · helicopter (2) · kite (2) · frame (2)
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