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Patents > Year granted: 1890 - 1899 & National tech categories : GB 4 without buoyant or HU V/h

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propulsion (9) · design (7) · frame (6) · LTA (6) · propeller (6) · navigation (5) · dirigibles (5) · wings (5) · airplane (4) · construction (4) · rudder (3) · propellers (3) · heavier-than-air (3) · hybrid (3) · flapping (3) · helicopter (3)
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Showing below up to 27 results in range #1 to #27.

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