Drilldown: Patents

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Patents > Year filed: 1917 & Filing date: 1910 - 1919 & National tech categories : CA 244/31 or DE 77 or HU V/h & First filing : No or Yes

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airplane (15) · design (9) · Airship (9) · propellers (9) · subsystem (6) · construction (5) · aerodynamics (4) · wings (4) · Frame (4) · safety (4) · lift (3) · instrument (3) · texture (3) · Biplane (3)
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Showing below up to 41 results in range #1 to #41.

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