Drilldown: Patents

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Patents > Year granted: 1921 & Number of figures: 7-9

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airplane (8) · None (5) · wings (4) · longerons (3) · design (3) · construction (2) · aerial propeller (2) · lift (2) · landing (2) · spars (2) · Heavier-than-air (2) · control (2) · frame (2) · aerodynamics (2) · subsystem (2) · biplane (2)
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