Results 201 to 204 of about 739,679 (204)

Automatic coal mining machine and fluidized coal mining method

2022
JU YANG, XIE HEPING, ZHANG YONG, ZHU YAN, GAO FENG, NIE XIAODONG, WAN CHANGBING, SONG JINXIN, LU CHANG, LIU HONGBIN, REN ZHANGYU   +10 more
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coal mining

2014
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Coal-Mining

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James Mckillop, 'A Visit To The Coal Mines Of America', In Coal And American Coal Mining (1876), Extract

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