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Patents > National tech categories: FR 6.4 & CPCs: CPC B64B1/00 & Number of figures: 1-2

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LTA (27) · dirigible (8) · balloon (6) · Hybrid (5) · frame (4) · navigation (4) · stability (4) · rigid (3) · safety (3) · construction (3) · balloons (3) · ballonet (3) · airplane (3) · nacelle (3)
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