Drilldown: Patents

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Patents > Publication date: 1921 & National tech categories: FR 6.4 & Number of text pages: 3-11

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airplane (12) · design (8) · construction (6) · frame (6) · aerodynamics (5) · propellers (5) · wings (4) · stability (4) · lift (4) · heavier-than-air (3) · chassis (3) · control (3) · propulsion (3) · subsystem (3) · sustentation (3)
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