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Patents > National tech categories : CH 129b or GB 4 aëroplanes & Number of diagram pages: 2-20

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airplane (14) · stability (10) · frame (9) · design (8) · wings (6) · navigation (6) · whole (5) · propellers (4) · control (3) · Rudder (3) · propeller (3) · Lift (3) · construction (3) · automatic stability (3)
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