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Patents > National tech categories: USPC 244/90R & Number of text pages: 3-4

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airplane (19) · stability (14) · frame (13) · navigation (8) · None (6) · aileron (5) · rudder (5) · wheels (4) · control (4) · piloting (3) · wings (3) · automatic stability (3) · airfoil (3) · construction (3) · landing (2) · Design (2) · Whole (2) · steering (2) · biplane (2)
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