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公开(公告)号：US3133025A
公开(公告)日：1964-05-12
申请号：US2667360
申请日：1960-05-04
Applicant: STANDARD OIL CO
Inventor： WALKER DONALD C , GIRMAN BERNARD A
IPC: G21G4/06
CPC classification number: G21G4/06
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