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Patents > Year filed: 1917 & Office: DE & Inventor country: DE

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airplane (8) · propeller (8) · None (7) · control (7) · navigation (6) · subsystem (5) · rudder (5) · instrument (5) · steering (4) · propulsion (4) · fuselage (4) · frame (4) · design (4) · wings (4) · construction (3) · gas (3) · safety (3)
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