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Patents > Inventor country : AH or CH & National tech categories : FR 6.4 or GB 4 propel & steer & Number of diagram pages: 1-2

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frame (8) · construction (7) · LTA (6) · airplane (6) · rudder (5) · design (5) · propellers (5) · propulsion (4) · navigation (4) · subsystem (3) · wings (3) · control (3) · steering (3)
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