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Patents > Year filed: 1897 & National tech categories : AT 30 or GB 4 propel & steer

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navigation (10) · propulsion (8) · propeller (7) · frame (6) · rudder (5) · wings (4) · electricity (4) · flapping (3) · electronics (3) · LTA (3) · airplane (3) · communications (3) · takeoff (2) · remote control (2) · stability (2) · jet (2) · design (2) · hybrid (2) · heavier-than-air (2)
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Showing below up to 21 results in range #1 to #21.

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