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2899800
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Information
Patent Grant
2899800
References
Source
Patent Number
2,899,800
Date Filed
Not available
Date Issued
Tuesday, August 18, 1959
64 years ago
CPC
E21D23/088 - by means of wheels, rollers, caterpillars, belts or worm screws
US Classifications
405 - Hydraulic and earth engineering
248 - Supports
299 - Mining or in situ disintegration of hard material
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