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1491373
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Information
Patent Grant
1491373
References
Source
Patent Number
1,491,373
Date Filed
Not available
Date Issued
Tuesday, April 22, 1924
100 years ago
CPC
E02D3/11 - by thermal, electrical or electro-chemical means
E21D1/14 - Freezing apparatus
US Classifications
299 - Mining or in situ disintegration of hard material
076 - Metal tools and implements, making
175 - Boring or penetrating the earth
405 - Hydraulic and earth engineering
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