Frictional ignition with coal mining bits
By: by Welby G. Courtney.
Series: Information circular (United States. Bureau of Mines) -- 9251.
Publisher: Dept. of the Interior
Published: 1990
Place of publication: Washington, DC
Language: eng
Number of pages: 25
Subjects: Coal-cutting bits -- Testing; Friction.; Methane -- Combustion
Notes:  89600350 // t_oclc

Bibliogr.

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