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Patents > Year granted: 1920 - 1929 & IPCs : IPC B64C25/00 or IPC B64C3/38 or IPC B64C39/00

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CPCs:
CPC B64F2700/6226 (9) · CPC B64C25/06 (7) · CPC B64C3/385 (6) · CPC B64C2700/6295 (5) · CPC B64C39/00 (5) · CPC B64C25/62 (4) · CPC B64C25/64 (3) · CPC B64C39/08 (3) · CPC B64C3/38 (3) · CPC B64C25/00 (2) · CPC B64C39/003 (2) · CPC Y02T50/145 (2) · CPC B64C13/02 (2) · CPC B64C1/26 (2) · CPC B64C39/005 (2)
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Showing below up to 38 results in range #1 to #38.

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