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3613383
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Information
Patent Grant
3613383
References
Source
Patent Number
3,613,383
Date Filed
Not available
Date Issued
Tuesday, October 19, 1971
53 years ago
CPC
E21D9/124 - Helical conveying means therefor
E21D9/0875 - with a movable support arm carrying cutting tools for attacking the front face
US Classifications
405 - Hydraulic and earth engineering
299 - Mining or in situ disintegration of hard material
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