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2810567
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Information
Patent Grant
2810567
References
Source
Patent Number
2,810,567
Date Filed
Not available
Date Issued
Tuesday, October 22, 1957
66 years ago
CPC
E21C25/34 - Chains
US Classifications
299 - Mining or in situ disintegration of hard material
175 - Boring or penetrating the earth
335 - Electricity: magnetically operated switches, magnets, and electromagnets
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