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Patents > Year granted: 1912 & National tech categories : DE 77h.14 or HU V/h

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airplane (18) · subsystem (14) · design (12) · whole (10) · propellers (9) · construction (9) · frame (5) · wings (5) · Automatic stability (4) · aerodynamics (4) · Stability (4) · helicopter (3) · monoplane (3) · propulsion (3) · motors (2) · chassis (2) · airship (2) · Wheels (2) · lift (2)
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