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Mechanical props; evolution of mechanical roof supports; details of performance of 20 types of marching props designed for operations during mining of coal beds of various thicknesses.
Mechanical props; evolution of mechanical roof supports; details of performance of 20 types of marching props designed for operations during mining of coal beds of various thicknesses.
Soutenement mecanise des tailles
Soutenement mecanise des tailles
Liegeois, R. (author)
1966
66 pages
Article (Journal)
French
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