Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method of supporting mine roofs
A method, patented by William Griffith, of blasting down roof and blasting up floor to form a dam, then filling back of dam. (2000 w.) (No. 28552 C)
Method of supporting mine roofs
A method, patented by William Griffith, of blasting down roof and blasting up floor to form a dam, then filling back of dam. (2000 w.) (No. 28552 C)
Method of supporting mine roofs
Mines Min
1911
Ills.
Aufsatz (Zeitschrift)
Englisch
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