Invention Grant
- Patent Title: Oil well drilling tackle
- Patent Title (中): 油井钻机
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Application No.: US3102335Application Date: 1935-07-12
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Publication No.: US2052074APublication Date: 1936-08-25
- Inventor: BLACK LESTER C
- Applicant: BLACK LESTER C
- Assignee: Lester C Black
- Current Assignee: Lester C Black
- Priority: US3102335 1935-07-12
- Main IPC: B66D3/06
- IPC: B66D3/06
Information query
