Invention Grant
- Patent Title: Split expansion-bit for drilling oil-wells.
- Patent Title (中): 用于钻井钻井的分体膨胀钻头。
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Application No.: US1901069835Application Date: 1901-07-26
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Publication No.: US690359APublication Date: 1901-12-31
- Inventor: BURT ANDREW B
- Applicant: BURT ANDREW B
- Assignee: Andrew B Burt
- Current Assignee: Andrew B Burt
- Priority: US1901069835 1901-07-26
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