Invention Grant
- Patent Title: Core lifting arrangement for deep well drills
- Patent Title (中): 深井钻井的核心提升安排
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Application No.: US69741446Application Date: 1946-09-17
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Publication No.: US2499543APublication Date: 1950-03-07
- Inventor: TOWNSEND LAWRENCE E
- Applicant: TOWNSEND LAWRENCE E
- Assignee: Lawrence E Townsend
- Current Assignee: Lawrence E Townsend
- Priority: US69741446 1946-09-17
- Main IPC: E21B25/12
- IPC: E21B25/12
Information query
