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Patents > Year filed: 1914 & National tech categories : DE 77h.5 or HU V/h & IPCs: None

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airplane (25) · frame (8) · wings (6) · stability (6) · Wheels (6) · Chassis (5) · construction (5) · biplane (5) · design (5) · airship (4) · aerodynamics (3) · lift (3)
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