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Patents > IPCs: IPC B64C39/00 & Number of text pages: 1

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propulsion (8) · None (6) · Propellers (5) · Airplane (5) · Design (4) · LTA (4) · helicopter (3) · Frame (3) · hybrid (3) · whole (2) · construction (2) · chassis (2) · monoplane (2) · Marine (2) · Airship (2)
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