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2979142
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Information
Patent Grant
2979142
References
Source
Patent Number
2,979,142
Date Filed
Not available
Date Issued
Tuesday, April 11, 1961
63 years ago
CPC
E21B4/12 - Electrically operated hammers
Y10T74/1527 - Screw and nut devices
US Classifications
175 - Boring or penetrating the earth
074 - Machine element or mechanism
173 - Tool driving or impacting
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