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公开(公告)号:US2610689A
公开(公告)日:1952-09-16
申请号:US69151946
申请日:1946-08-19
Applicant: OIL CT TOOL COMPANY
Inventor: ECKEL JOHN E
CPC classification number: E21B33/04 , E21B2033/005
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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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公开(公告)号:US2591142A
公开(公告)日:1952-04-01
申请号:US2138448
申请日:1948-04-16
Applicant: OIL CT TOOL COMPANY
Inventor: ECKEL JOHN E
IPC: E21B33/04
CPC classification number: E21B33/04
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公开(公告)号:US2532662A
公开(公告)日:1950-12-05
申请号:US773848
申请日:1948-02-12
Applicant: OIL CT TOOL COMPANY
Inventor: ECKEL JOHN E , JONES MARVIN R
CPC classification number: E21B33/0422 , E21B19/10
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