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Patents > Year filed: 1918 & Tech fields: Construction & Number of diagram pages: 1-2

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None (3) · 21638D (2)
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CPCs:
CPC B64C3/00 (9) · CPC B64C1/065 (6) · CPC B64C3/185 (5) · CPC B64C2700/6233 (5) · CPC B64C2001/0063 (4) · CPC B64C2001/0081 (4) · None (3) · CPC B64C1/00 (3) · CPC B64C3/26 (3) · CPC B64C1/064 (3) · CPC B64C3/18 (3) · CPC B64D33/10 (2) · CPC B64C39/00 (2) · CPC B64C2700/6235 (2) · CPC B64C2700/6295 (2) · CPC B64C1/08 (2)
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