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3390915
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Patent Grant
3390915
References
Source
Patent Number
3,390,915
Date Filed
Not available
Date Issued
Tuesday, July 2, 1968
56 years ago
CPC
E21C25/56 - Slitting by cutter cables or cutter chains or by tools drawn along the working face by cables or the like, in each case guided parallel to the face
E21C35/16 - by making use of the timbering, filling, or other supports
US Classifications
299 - Mining or in situ disintegration of hard material
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