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公开(公告)号：US2702712A
公开(公告)日：1955-02-22
申请号：US11455349
申请日：1949-09-08
Applicant: COLMOL COMPANY
Inventor： SNYDER CLIFFORD H , TURNER DOUGLAS A
IPC: E21C35/19
CPC classification number: E21C35/19 , Y10T279/17786 , Y10T403/4648
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2.发明授权
公开(公告)号：US2877999A
公开(公告)日：1959-03-17
申请号：US11455149
申请日：1949-09-08
Applicant: COLMOL COMPANY
Inventor： SNYDER CLIFFORD H , TURNER DOUGLAS A , CALVIN FUNK HARRY
IPC: E21C27/22
CPC classification number: E21C27/22
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