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2868507
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Information
Patent Grant
2868507
References
Source
Patent Number
2,868,507
Date Filed
Not available
Date Issued
Tuesday, January 13, 1959
65 years ago
CPC
E21B4/12 - Electrically operated hammers
US Classifications
173 - Tool driving or impacting
175 - Boring or penetrating the earth
318 - Electricity: motive power systems
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