Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Features of system developed at Willow Grove No 10 mine of Hanna Coal Co, working Pittsburgh No 8 seam; system involves setting two 16-ft 60-lb steel timber rails per room cut in all production sections; nature of roof requires four posts to be set under each "timber, " with six additional posts under roof; description of experimental truck, including power lifting and power sawing of posts. Before Coal Min Inst America.
Features of system developed at Willow Grove No 10 mine of Hanna Coal Co, working Pittsburgh No 8 seam; system involves setting two 16-ft 60-lb steel timber rails per room cut in all production sections; nature of roof requires four posts to be set under each "timber, " with six additional posts under roof; description of experimental truck, including power lifting and power sawing of posts. Before Coal Min Inst America.
Mechanical timbering truck
Coal Min
Zachar, F.R. (Autor:in)
Coal Mining ; 22
1945
Aufsatz (Zeitschrift)
Englisch
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