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Patents > National tech categories : GB 4 propel & steer or HU V/h & Family year: 1917

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airship (13) · airplane (10) · design (7) · Instrument (6) · propellers (5) · construction (5) · frame (4) · subsystem (4) · wood (3) · safety (3) · wings (2) · texture (2) · metallurgy (2) · lift (2) · aerodynamics (2) · Illumination (2) · equilibrium (2) · Altimeter (2) · Altitude (2) · control (2)
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