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Patents > CPCs : CPC B64B1/58 or CPC F03D11/00 & Number of claims: 6-30

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LTA (13) · balloon (6) · ballonet (4) · stability (4) · gas (4) · car (4) · navigation (4) · dirigible (4) · fabric (4) · propeller (3) · texture (3) · hybrid (3) · propulsion (3) · airplane (3) · construction (3)
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