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Patents > Year granted: 1915 & Inventor country : DE or ES

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airplane (16) · frame (11) · wings (9) · None (6) · LTA (6) · subsystem (6) · design (6) · biplane (5) · construction (5) · Texture (4) · propulsion (4) · stability (4) · marine (3) · hybrid (3) · Fabric (3) · flapping (3) · airfoil (3) · airship (3)
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