Combination mill and under-reamer for oil wells
United States Patent 2690897
US Patent References:
Underreamer
- - 1478306
Expansible boring tool for hydraulic boring appliances
- - 1752092
Plunger actuated underreamer
- - 1839588
Hydraulic underreamer
- - 1857616
Pipe cutter
- - 2108330
Underreamer
- - 1478306
Expansible boring tool for hydraulic boring appliances
- - 1752092
Plunger actuated underreamer
- - 1839588
Hydraulic underreamer
- - 1857616
Pipe cutter
- - 2108330
Inventors:
Clark Jr., Robert E.
Publication Date:
10/05/1954
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Export Citation:
Assignee:
Clark Jr., Robert E.
Primary Class:
Other Classes:
175/315, 175/393, 175/271, 175/406, 175/434, 166/55.800, 175/317, 175/266
International Classes:
E21B10/32; E21B29/00; E21B10/26
US Patent References: