Title:
Means for drilling holes in rock formation at or below the earth's surface
United States Patent 2634106
Inventors:
Foster, Howard L.
Publication Date:
04/07/1953
Export Citation:
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Assignee:
Foster, Howard L.
Primary Class:
175/255
Other Classes:
175/239
International Classes:
E21B25/10; E21B25/00
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US Patent References:
2537605Drilling bore holes
2488003Well-drilling tool
2313806Coring apparatus
2065725Method of core drilling
2034072Core drill
1720700Core drill
1008904N/A
0312093N/A