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Patents > Year granted: 1920 - 1929 & Tech fields: airplane & Number of diagram pages: 2-4

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CPCs:
CPC B64C3/00 (7) · None (6) · CPC B64C2700/6233 (4) · CPC B64C3/56 (3) · CPC B64C3/54 (2) · CPC B64C13/30 (2) · CPC B64F2700/6226 (2) · CPC B64C39/00 (2)
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