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Use of a large-diameter auger in mining pitching anthracite beds
Use of a continuous borer in mining pitching anthracite beds
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Published Year
1960-1969 (2)
Subject
Coal-mining machinery (2)
Augers (1)
Boring machinery (1)
Author
Schimmel, J. T. (2) *
Markle, Donald. (1)
Tavenner, W. H. (1)
Tavenner, William H. (1)
