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1449075
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Information
Patent Grant
1449075
References
Source
Patent Number
1,449,075
Date Filed
Not available
Date Issued
Tuesday, March 20, 1923
101 years ago
CPC
E21D9/01 - Methods or apparatus for enlarging or restoring the cross-section of tunnels
US Classifications
037 - Excavating
172 - Earth working
404 - Road structure, process, or apparatus
414 - Material or article handling
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