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Patents > Year filed: 1891 & Inventor country : DE or FR

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propulsion (10) · LTA (9) · navigation (5) · whole (4) · balloon (3) · car (3) · construction (2) · engine (2) · airfoil (2) · airplane (2) · gas (2) · hydrogen (2) · propellers (2) · dirigible (2) · propeller (2)
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