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Patents > Applicant person : Edward Spencer or None & Related to aircraft: 0.5

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USPC 244/3.23 (10) · GB 4 propel & steer (5) · None (5) · USPC 89/1.3 (2) · USPC 102/371 (2) · FR 15.1 (2) · GB 4 aërostats (2)
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