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Patents > Assigned to: None & National tech categories : GB 4 propel & steer or USPC 244/90R & Number of diagram pages: 3-70

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airplane (16) · frame (15) · navigation (13) · stability (13) · rudder (9) · propulsion (6) · propeller (5) · None (3) · flapping (3) · whole (3) · wheels (3) · heavier-than-air (3) · wings (3) · airfoil (3) · aileron (3)
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