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1358767
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Patent Grant
1358767
References
Source
Patent Number
1,358,767
Date Filed
Not available
Date Issued
Tuesday, November 16, 1920
103 years ago
CPC
E21C37/08 - Devices with pistons, plungers, or the like, pressed locally against the wall of the borehole
US Classifications
299 - Mining or in situ disintegration of hard material
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