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公开(公告)号：US1892922A
公开(公告)日：1933-01-03
申请号：US47293130
申请日：1930-08-04
Applicant: STANDARD OIL CO CALIFORNIA
Inventor： ZEITFUCHS EDWARD H , HERRICK HENRY N
IPC: E21B47/022
CPC classification number: E21B47/022
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