Open AccessFlexible roof drill for low coal. Final technical report
Author(s) -
James H. Finney,
R. Eakin,
D.C. Rich,
T. Wall
Publication year - 1979
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - Uncategorized
Resource type - Reports
DOI - 10.2172/6822233
Subject(s) - drill , drilling , roof , coal mining , mining engineering , drill string , coal , engineering , structural engineering , mechanical engineering , waste management
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