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Patents > Year filed: 1881

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LTA (21) · balloon (10) · navigation (7) · frame (6) · None (4) · car (4) · propulsion (4) · Flying machine (2) · whole (2) · wheels (2) · steam (2) · military (2) · marine (2) · aerostat (2) · hybrid (2) · windmill (2) · control (2)
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