Drilldown: Patents

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Patents > Publication date: 1921 & National tech categories: FR 6.4 & Number of text pages: 3-4

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airplane (11) · design (8) · construction (6) · frame (6) · propellers (5) · wings (4) · aerodynamics (4) · sustentation (3) · subsystem (3) · Stability (3) · lift (3) · heavier-than-air (2) · marine (2) · chassis (2) · propulsion (2) · control (2) · motors (2) · None (2) · hydrodynamics (2) · helicopter (2)
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