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Development of a mechanical roof breaker for ground control in longwall operations under massive roof / by Sathit Tandanand.

By: Contributor(s): Series: United States. Report of investigations ; 8416 | Report of investigations (United States. Bureau of Mines) ; 8416.Publication details: Washington : U.S. Dept. of the Interior, Bureau of Mines, 1979.Description: 20 p. : illSubject(s):
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