Well-drilling apparatus
United States Patent 2498192
US Patent References:
/RE20405.html
- - RE20405

Milling tool
- - 1636032

Side wall drilling organization
- - 1804819

Removable straightening tool
- - 2065896

Well drilling whip stock
- - 2101185


Inventors:
Stanley, Wright
Publication Date:
02/21/1950
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Assignee:
Eastman, Oil Well Survey Compan
Primary Class:
175/82
Other Classes:
175/381, 175/392, 175/397
International Classes:
E21B7/08
US Patent References:
2196517Winged whipstock
2323027Drilling implement
2345766Deflecting tool