NASA NTRS · 19840000160
Pillar-Trimming System
Abstract
Trimming and reinforcing of coal pillars allows more coal recovery. Conceptual coal-pillar trimming machine use two counterrotating cutting drums to take corners off roof support pillars in coal mines.
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Collins, E. R., Jr.. 1985-01-01. Pillar-Trimming System. https://ntrs.nasa.gov/citations/19840000160
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