Drilldown: Patents

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Patents > National tech categories : GB 4 propel & steer or USPC 244/60 & Number of text pages: 4-50000000

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propulsion (8) · navigation (8) · propeller (7) · frame (5) · flapping (4) · wings (3) · rudder (3) · marine (3) · airplane (3) · heavier-than-air (2) · stability (2) · subsystem (2) · car (2)
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