Drilldown: Patents

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Patents > Family year: 1909 & Number of text pages: 8-12

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Airplane (11) · None (6) · propulsion (6) · propeller (5) · frame (5) · stability (5) · Safety (4) · propellers (4) · design (4) · Whole (3) · flapping (3) · biplane (3) · marine (3) · hybrid (3) · gliders (3) · automatic stability (3)
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