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Patents > CPCs: CPC B64C39/08 & Number of text pages: 3-4 & Number of diagram pages: 2-50000000

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airplane (14) · None (9) · frame (9) · stability (5) · rudder (5) · navigation (5) · multiplane (5) · wheels (4) · propulsion (4) · construction (4) · Design (4) · landing (4) · safety (3) · propellers (3) · propeller (3) · Wings (3)
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