Drilldown: Patents

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Patents > Year filed: 1910 - 1919 & Inventor country : DE or ES & IPCs : IPC B64B1/58 or IPC B64C23/00

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LTA (30) · frame (17) · airplane (10) · fabric (8) · stability (7) · whole (7) · Construction (7) · envelope (6) · design (6) · propeller (5) · hybrid (5) · takeoff (4) · texture (4) · gyroscope (4) · Balloons (4) · Airship (4) · balloon (4) · propellers (4) · propulsion (4)
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