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Patents > Inventor country: US & National tech categories : GB 4 propel & steer or USPC 244/131

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frame (8) · None (6) · navigation (4) · airplane (4) · construction (4) · propeller (3) · control (3) · stability (3) · marine (2) · aileron (2) · aluminum (2) · whole (2) · adjudicated (2) · rudder (2) · electricity (2)
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