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Patents > Office : ?? or CA or DE or DEG or JP or RU or SE or Other & National tech categories : DE 77h.15 or GB 4 propel & steer & Number of text pages: 3-70

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propulsion (12) · navigation (10) · propeller (7) · LTA (6) · frame (6) · airplane (4) · marine (4) · rudder (4) · heavier-than-air (4) · stability (4) · subsystem (4) · flapping (3) · wings (3) · car (3) · design (3)
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