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Patents > Year granted: 1915 & Inventor country: DE

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airplane (16) · frame (10) · wings (9) · None (6) · design (6) · subsystem (5) · biplane (5) · Construction (5) · propulsion (4) · LTA (4) · stability (4) · Texture (4) · fabric (3) · hybrid (3) · flapping (3) · marine (3) · airfoil (3)
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