Drilldown: Patents

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Patents > Application number: None & Publication date: 1920 - 1929 & First filing: No

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airplane (17) · propellers (10) · frame (9) · Design (9) · sensors (8) · aerodynamics (6) · Construction (5) · Instrument (4) · Parachutes (4) · propulsion (4)
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None (13) · Patent FR-1916-501550 (7) · Patent DE-1916-10-07 Oscar Gerhardt (2) · Patent DE-1917-02-16 Oscar Gerhardt (2) · Patent US-1918-1589780 (2) · Patent 1915-11-05 Käthe Paulus (2)
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