Effect of ultralow frequency signaling on blasting array current /
- 出版日期：1993.
- 出版者：U.S. Dept. of the Interior, Bureau of Mines,
- 页数：7 p. :
- 出版地：Washington, D.C. :
- 第一责任说明：by Kenneth E. Hjelmstad, Russell E. Griffin.
- 尺寸：28 cm.
- 分类号：a721 ; a725 ; a633
MARC全文
02h0059191 20150212165058.0 s1993 dcuab fr |000|||eng | CNY200.00 NGL a721 ; a725 ; a633 Hjelmstad, Kenneth E. Effect of ultralow frequency signaling on blasting array current / by Kenneth E. Hjelmstad, Russell E. Griffin. Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1993. 7 p. : ill., maps ; 28 cm. Report of investigations (United States. Bureau of Mines) ; 9479 Electric detonators ; Electromagnetic waves ; Fire alarms. Safety measures. ; Transmission. aGriffin, Russell E. Report of investigations (United States. Bureau of Mines) ; 9479. aCN bNGL 010001 P 720.66 R29u v9479 ; rCNY200.00 ; h2 whx017