Flame boring apparatus
United States Patent 2742555
US Patent References:
Means for electric-arc welding, cutting, and the like
- - 1371094
Oil well drilling
- - 1847864
Method of making bore holes
- - 1898926
Electric cutting torch
- - 1927135
Electric arc heating
- - 2398427
Means for electric-arc welding, cutting, and the like
- - 1371094
Oil well drilling
- - 1847864
Method of making bore holes
- - 1898926
Electric cutting torch
- - 1927135
Electric arc heating
- - 2398427
Inventors:
Murray, Robert W.
Publication Date:
04/17/1956
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Assignee:
Murray, Robert W.
Primary Class:
Other Classes:
175/206, 173/74, 175/210, 219/75
International Classes:
E21B7/15; E21B7/14
US Patent References: