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1332689
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Patent Grant
1332689
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Source
Patent Number
1,332,689
Date Filed
Not available
Date Issued
Tuesday, March 2, 1920
104 years ago
CPC
E21C25/62 - Machines for making slits approximately perpendicular to the seams either level with, or above or below the level of, the machine
US Classifications
299 - Mining or in situ disintegration of hard material
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