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Search U.S. government technical reports digitized or harvested by TRAIL.
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2 results returnedNovel coal-cutting bits and their wear resistances
Improved drilling of coal measure rocks for underground mine void detection and exploration programs
Published Year
Subject
- Coal-cutting bits (2) *
- Abandoned coal mines (1)
- Coal mines and mining--Safety measures (1)
- Mechanical wear (1)
- Mine surveying (1)
- Polyethylene oxide (1)
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