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Patents > Related to aircraft: Yes & National tech categories: AT 77d

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airplane (23) · frame (14) · LTA (13) · construction (10) · propellers (9) · airship (9) · propulsion (8) · design (7) · stability (7) · navigation (7) · control (6) · wheels (4) · propeller (4) · balloon (4) · wings (4) · Aerodynamics (4) · automatic stability (4) · gas (4)
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