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Patents > IPCs : IPC B64B1/00 or IPC B64C27/04 & Number of figures: 12-18

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LTA (13) · frame (5) · propulsion (4) · compartments (4) · Ascension (4) · propellers (4) · navigation (3) · safety (3) · Helicopter (3) · dirigibles (3) · Design (3) · balloon (3) · Airship (3)
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