Reduction in frictional ignition due to conical coal-cutting bits /
- 出版日期：1987.
- 出版者：U.S. Dept. of the Interior, Bureau of Mines,
- 页数：10 p. :
- 出版地：Washington, D.C. :
- 第一责任说明：by Lung Cheng, A. L. Furno, Welby G. Courtney.
- 尺寸：28 cm.
- 分类号：a713 ; a749
MARC全文
02h0058613 20141117163647.0 s1987 dcuab fr |000|||eng | CNY200.00 NGL a713 ; a749 Cheng, Lung. Reduction in frictional ignition due to conical coal-cutting bits / by Lung Cheng, A. L. Furno, Welby G. Courtney. Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1987. 10 p. : ill., maps ; 28 cm. Report of investigations (United States. Bureau of Mines) ; 9134 Coal-cutting bits ; Mine fires Testing. ; Prevention and control. aCourtney, Welby G. ; aFurno, A. L. Report of investigations (United States. Bureau of Mines) ; 9134. aCN bNGL 010001 P 720.66 R29u v9134 ; rCNY200.00 ; h1 whx015