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Search U.S. government technical reports digitized or harvested by TRAIL.
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8 results returnedUnderground transportation of coal :Progress report 1
Underground transportation of coal :progress report [No.] 2
Multiple-shift mechanical mining in some bituminous-coal mines.
An analysis of the use of electricity at coal mines.
Two devices to prevent electric arcs with airdox operations in coal mines
Mechanical mining in some bituminous-coal mines.
A study of stray electric currents in airdox systems in coal mines
Published Year
Subject
- Coal mines and mining--Equipment and supplies (8) *
- Coal mines and mining--Electric equipment (3)
- Coal mines and mining--Safety measures (3)
- Coal-handling machinery (3)
- Compressed air (3)
- Bituminous coal (2)
- Mine haulage (2)
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