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Patents > Office: US & CPCs: CPC B64B1/00 & Number of text pages: 4-30

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LTA (33) · navigation (16) · propulsion (15) · propeller (14) · balloon (10) · car (9) · frame (9) · rudder (7) · safety (7) · stability (6) · marine (6) · hybrid (6) · None (5) · flapping (5) · cargo (5) · wheels (4) · airplane (4) · landing (4) · airship (4)
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