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公开(公告)号：US2694562A
公开(公告)日：1954-11-16
申请号：US1262648
申请日：1948-03-02
Applicant: COLMOL COMPANY
Inventor： SNYDER CLIFFORD H , LAMM ARNOLD E , CAROTHERS WILLIAM D , MCCARTHY VINCENT J
IPC: E21C27/22
CPC classification number: E21C27/22
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