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公开(公告)号：US2589483A
公开(公告)日：1952-03-18
申请号：US66020846
申请日：1946-04-06
Applicant: OIL CT TOOL COMPANY
Inventor： ECKEL JOHN E , FRITZ RICHARD
IPC: E21B33/04
CPC classification number: E21B33/04
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