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公开(公告)号：US3515212A
公开(公告)日：1970-06-02
申请号：US3515212D
申请日：1968-09-20
Applicant: TEXACO INC
Inventor： ALLEN JOSEPH C , TEASDALE THOMAS S , CADY GEORGE C
IPC: E21B43/243 , E21B43/30 , E21B43/24
CPC classification number: E21B43/30 , E21B43/243
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