Search
Search U.S. government technical reports digitized or harvested by TRAIL.
Keyword Search
8 results returnedSearch results
- Mechanical mining in some bituminous-coal mines :progress report 9 : face haulage
- Extracting final stump in pillars and pillar lifts with continuous miners
- Use of a large-diameter auger in mining pitching anthracite beds
- Longwall mining with a German coal planer :Pocahontas No. 3 coalbed, Keystone, W. Va.
- Developing a lock-hopper feeder for hydraulic hoisting of coal
- Use of a continuous borer in mining pitching anthracite beds
- Pneumatic transportation of solidsproceedings: Institute of Gas Technology - Bureau of Mines Symposium, Morgantown, W. Va., October 19-20, 1965
- Longwall mining in bituminous coal mines with planers, shearer- loaders, and self-advancing hydraulic roof supports
