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Patents > Office : ?? or DE & Filing date: 1918 & Number of diagram pages: 1

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airplane (15) · wings (7) · construction (7) · subsystem (7) · frame (7) · propeller (5) · design (5) · None (5) · motors (4) · Propulsion (4) · control (4) · biplane (3) · airfoil (3) · lift (3) · metal (3) · piloting (3)
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