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Patents > Year granted: 1920 & Inventor country: DE & Publication date: 1900 - 1999

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airplane (29) · frame (13) · construction (10) · military (9) · design (9) · biplane (7) · motors (6) · projectile (6) · aerodynamics (6) · airship (5) · wings (5) · subsystem (5) · LTA (5) · fuselage (4) · propeller (4)
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