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1.发明授权
公开(公告)号：US3116237A
公开(公告)日：1963-12-31
申请号：US11872161
申请日：1961-06-21
Applicant: STAMICARBON
Inventor： FONTEIN FREERK J , KOPPEN CHRISTIANNS W J VAN
IPC: E21B21/06
CPC classification number: E21B21/06
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