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2870991
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Information
Patent Grant
2870991
References
Source
Patent Number
2,870,991
Date Filed
Not available
Date Issued
Tuesday, January 27, 1959
66 years ago
CPC
E21B7/003 - Drilling with mechanical conveying means
E21B7/002 - Drilling with diversely driven shafts extending into the borehole
Y10T74/177 - Rack and pinion adjusting means
US Classifications
175 - Boring or penetrating the earth
074 - Machine element or mechanism
173 - Tool driving or impacting
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