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2336335
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Information
Patent Grant
2336335
References
Source
Patent Number
2,336,335
Date Filed
Not available
Date Issued
Tuesday, December 7, 1943
81 years ago
CPC
E21B10/22 - characterised by bearing, lubrication or sealing details
E21B10/083 - with longitudinal axis
E21B10/16 - characterised by tooth form or arrangement
US Classifications
175 - Boring or penetrating the earth
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