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Patents > Office : ?? or CA or DE or JP or RU or SE or SU or UN & National tech categories : DE 77h.15 or None & Number of text pages: 3-70

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airplane (17) · design (13) · propellers (10) · frame (7) · control (7) · construction (7) · wings (6) · LTA (5) · aerodynamics (5) · Steering (5) · propulsion (4) · Stability (4) · subsystem (4) · Lift (4) · rudder (3) · HTA (3) · military (3)
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