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Patents > Inventor country: US & National tech categories : BE K or USPC 244/66

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None (13) · frame (8) · Airplane (8) · propeller (8) · navigation (8) · LTA (8) · design (6) · stability (5) · hybrid (5) · propulsion (4) · construction (4) · helicopter (4) · wheels (3) · rudder (3) · propellers (3) · wings (3) · aerodynamics (3)
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