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Patents > Year granted: 1919 & Office : DE or DK or UN & Supplementary to patent : DE79446 or Patent NO-1915-12-15 Carl Alfred Johansson or None

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airplane (10) · subsystem (7) · frame (5) · propulsion (5) · wings (4) · stability (4) · propeller (4) · navigation (3) · None (3) · LTA (3) · biplane (3) · safety (2) · fuselage (2) · motor (2) · military (2) · human-powered (2) · flapping (2) · steering (2)
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