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Patents > National tech categories : GB 4 propel & steer or USPC 244/131 & Number of text pages: 6-15

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frame (8) · airplane (6) · navigation (6) · propeller (5) · propulsion (4) · stability (4) · rudder (4) · heavier-than-air (3) · adjudicated (2) · whole (2) · steel (2) · flapping (2)
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