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2638321
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Information
Patent Grant
2638321
References
Source
Patent Number
2,638,321
Date Filed
Not available
Date Issued
Tuesday, May 12, 1953
71 years ago
CPC
E21B7/1245 - using explosive means
E21B25/18 - the core receiver being specially adapted for operation under water
US Classifications
175 - Boring or penetrating the earth
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