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Patents > Year granted: 1909 & IPCs : IPC B64B1/62 or IPC B64C27/04

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LTA (7) · Propellers (5) · helicopter (4) · airplane (4) · Ascension (4) · Propulsion (4) · hydrogen (3) · gas (3) · balloon (3) · wings (2) · design (2) · safety (2) · ballonet (2)
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