Drilldown: Patents

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Patents > Year filed: 1920 - 1929 & National tech categories : USPC 24/714.3 or None

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Tech fields:
airplane (12) · None (7) · propeller (7) · propellers (5) · design (5) · frame (4) · propulsion (3) · control (3) · motor (3) · LTA (3) · landing (3) · wings (2) · takeoff (2) · steering (2) · seaplane (2) · safety (2) · marine (2) · construction (2) · compartments (2) · engine (2)
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Showing below up to 39 results in range #1 to #39.

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