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Patents > IPCs : IPC B64B1/58 or IPC B64C3/54 & Number of text pages: 4-20

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LTA (9) · stability (7) · None (6) · airplane (5) · navigation (5) · ballonet (4) · frame (4) · control (4) · car (3) · Hybrid (3) · airfoil (3) · balloon (3)
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