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Patents > Filing date: 1912 & National tech categories : HU V/h or USPC 244/46

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airplane (21) · Construction (13) · Design (11) · Propellers (10) · Frame (10) · Airship (7) · wings (6) · Aerodynamics (5) · Stability (5) · Fuselage (4) · flapping (4) · Chassis (4) · gliders (3) · automatic stability (3) · human-powered (3) · Equilibrium (2) · Biplane (2) · propulsion (2) · Parachutes (2) · LTA (2)
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