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2830791
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Patent Grant
2830791
References
Source
Patent Number
2,830,791
Date Filed
Not available
Date Issued
Tuesday, April 15, 1958
66 years ago
CPC
E21B4/12 - Electrically operated hammers
E21B7/24 - Drilling using vibrating or oscillating means
US Classifications
175 - Boring or penetrating the earth
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