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公开(公告)号：US2862557A
公开(公告)日：1958-12-02
申请号：US53389855
申请日：1955-09-12
Applicant: SHELL DEV
Inventor： UTENHOVE GERARD F L BARON VAN , TADEMA HARCO J , KETS DIRK C
IPC: E21B43/243
CPC classification number: E21B43/243
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