Underground coal extraction using a shearer With copyspace for text
Contributor: The 2R Artificiality
ID : 657364602
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Keywords
exploitation, miner, mine, technology, black, work, science, shield, factory, industry, engineering, rock, iron, geology, mineral, machine, machinery, equipment, industrial, power, coal, cave, mining, drill, hydraulic, track, conveyer, chisel, tunnel, extraction, cellar, underground, horizontal, harvester, boring, shaft, dig, cutter, inside, borer, heavy, dark, indoor, hard, clear, excavate, illuminatedRelated items
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