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公开(公告)号：US2287826A
公开(公告)日：1942-06-30
申请号：US28642839
申请日：1939-07-25
Applicant: STANDARD OIL CO CALIFORNIA
Inventor： POSTLEWAITE WILLIAM R , VERTREES RODNEY A
IPC: F16L58/12
CPC classification number: F16L58/12
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