Drilldown: Patents

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Patents > Inventor country: US & Family year: 1916 & Number of figures: 12-30

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HTA (6) · stability (5) · propellers (5) · airplane (4) · None (3) · biplane (3) · helicopter (3) · design (3) · wings (3) · frame (2) · propulsion (2) · construction (2) · control (2) · navigation (2) · flapping (2) · ascension (2)
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