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3558193
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Information
Patent Grant
3558193
References
Source
Patent Number
3,558,193
Date Filed
Not available
Date Issued
Tuesday, January 26, 1971
53 years ago
CPC
E21D19/04 - for use in drifting galleries
E21D9/0875 - with a movable support arm carrying cutting tools for attacking the front face
US Classifications
299 - Mining or in situ disintegration of hard material
405 - Hydraulic and earth engineering
454 - Ventilation
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