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Patents > Office: US & IPCs: IPC B64B1/00 & Number of text pages: 3-4

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LTA (21) · propulsion (8) · navigation (7) · balloon (7) · car (6) · frame (5) · dirigible (4) · airship (4) · parachute (3) · rudder (3) · design (2) · safety (2) · fabric (2) · hybrid (2) · landing (2) · airplane (2) · propellers (2) · wheels (2)
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