Drilldown: Patents

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Patents > Year filed: 1913 & First filing: Yes & Number of figures: 12-50000000

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None (9) · stability (9) · airplane (5) · automatic stability (4) · frame (4) · propellers (3) · propulsion (3) · flapping (2) · design (2) · military (2) · takeoff (2) · whole (2) · wheels (2) · wings (2)
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