Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Roof bolting through core drill holes
Holes, 9 in. in diam, drilled with core bit through 20 in. of bone and coal permit drilling of bolt holes and installation of roof bolts prior to taking down bone and coal.
Roof bolting through core drill holes
Holes, 9 in. in diam, drilled with core bit through 20 in. of bone and coal permit drilling of bolt holes and installation of roof bolts prior to taking down bone and coal.
Roof bolting through core drill holes
Mechanization
Mechanization ; 19
1955
2 pages
Aufsatz (Zeitschrift)
Englisch
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| Engineering Index Backfile | 1953
| Engineering Index Backfile | 1952
| Engineering Index Backfile | 1957
| Engineering Index Backfile | 1951
| Engineering Index Backfile | 1950