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Patents > Office: HU & Publication date: 1920 & Number of text pages: 1-2

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construction (9) · airplane (7) · LTA (6) · frame (6) · airship (6) · texture (4) · Motors (3) · design (3) · aerodynamics (3) · biplane (3) · chassis (2) · communications (2) · HTA (2) · balloons (2) · projectile (2) · wheels (2) · propellers (2) · Springs (2) · propulsion (2) · Safety (2)
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