NASA NTRS · 19790000363
Measuring coal thickness
Abstract
Laboratory tested concept, for measuring thickness of overhead coal using noncontacting sensor system coupled to controller and high pressure water jet, allows mining machines to remove virtually all coal from mine roofs without danger of cutting into overlying rock.
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Barker, C., Blaine, J., Geller, G., Robinson, R., Summers, D., Tyler, J.. 1980-04-01. Measuring coal thickness. https://ntrs.nasa.gov/citations/19790000363
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