A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Using extra long bolt in conjunction with conventional bolting plan, Island Creek Coal Co has developed system of roof support for thin seam operation that is successfully holding bad top in rooms up to 55 ft wide.
Using extra long bolt in conjunction with conventional bolting plan, Island Creek Coal Co has developed system of roof support for thin seam operation that is successfully holding bad top in rooms up to 55 ft wide.
Roof control in thin seams
Min Congress J
Barker, Jr., S. (author)
1959
3 pages
Article (Journal)
English
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