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Patents > National tech categories : DE 77h or USPC 244/35R & Number of diagram pages: 2-6

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airplane (14) · stability (8) · Frame (7) · control (5) · rudder (5) · propeller (5) · airfoil (4) · Aerodynamics (4) · navigation (4) · Construction (4) · Takeoff (4) · Design (4) · hybrid (4) · HTA (3) · monoplane (3) · LTA (3) · None (3) · Wings (3)
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