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Patents > National tech categories : USPC 244/65 or USPC 244/80 & Family year: 1900 - 1909

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stability (12) · airplane (10) · navigation (8) · helicopter (6) · propeller (5) · propulsion (5) · None (4) · frame (4) · car (4) · equilibrium (4) · lift (3) · rudder (3) · parachute (3) · control (3) · takeoff (3) · automatic stability (3)
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Showing below up to 32 results in range #1 to #32.

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