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Patents > Year granted: 1911 & National tech categories : CA 244/40 or HU V/h

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Airplane (18) · Design (17) · subsystem (17) · propellers (16) · Whole (15) · propulsion (10) · Construction (7) · Frame (7) · Stability (6) · wings (5) · Airship (4) · Ascension (4) · Helicopter (4) · lift (4) · Heavier-than-air (3) · aerodynamics (3) · automatic stability (3) · Sustentation (3)
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