Drilldown: Patents

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Patents > Office: FR & Publication date: 1920 & Number of text pages: 3-4

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design (8) · Airplane (8) · Construction (6) · wings (5) · Propellers (4) · control (4) · aerodynamics (3) · ascension (2) · lift (2) · military (2) · motors (2) · frame (2) · propulsion (2) · stability (2) · LTA (2) · descent (2) · whole (2) · sustentation (2) · biplane (2) · balloon (2)
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