Invention Grant
- Patent Title: Switch for oil well pumping equipment
- Patent Title (中): 切换油井抽水设备
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Application No.: US63473332Application Date: 1932-09-24
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Publication No.: US2018946APublication Date: 1935-10-29
- Inventor: CAVINS OMAR A
- Applicant: STANDARD OIL CO CALIFORNIA
- Assignee: Standard Oil Co California
- Current Assignee: Standard Oil Co California
- Priority: US63473332 1932-09-24
- Main IPC: H01H29/20
- IPC: H01H29/20
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