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1899438
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Information
Patent Grant
1899438
References
Source
Patent Number
1,899,438
Date Filed
Not available
Date Issued
Tuesday, February 28, 1933
91 years ago
CPC
E21B4/12 - Electrically operated hammers
E21B4/10 - continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
US Classifications
175 - Boring or penetrating the earth
173 - Tool driving or impacting
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