Title:
Well drilling device
United States Patent 2637527
Inventors:
Andrews Jr., Joseph B.
Publication Date:
05/05/1953
Export Citation:
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Assignee:
Andrews Jr., Joseph B.
Primary Class:
175/94
Other Classes:
173/35, 173/152, 173/197, 175/45, 175/99, 175/104
International Classes:
E21B4/04; E21B4/18; E21B7/06; E21B47/024; E21B4/00; E21B7/04; E21B47/02
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US Patent References:
2192909Diamond drill
1868833Apparatus for indicating angularity of crooked well holes
1411896Boring device and method for the production of vertical boreholes
1315422N/A
0840148N/A
0478791N/A
Foreign References:
GB126804A
DE317663C
DE347356C