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Patents > Filing date: 1920 - 1929 & National tech categories : USPC 244/8 or None

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airplane (12) · None (7) · design (5) · propellers (5) · propeller (4) · frame (4) · control (4) · LTA (3) · landing (3) · motor (3) · steering (3) · wings (3) · propulsion (3)
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Showing below up to 37 results in range #1 to #37.

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