Shot firing in coal mines by electricity controlled from outside.

Bibliographic Details

Corporate Author:	United States. Department of Commerce
Format:	Government Document eBook
Language:	English
Published:	[Washington] : GPO, 1915.
Series:	Mines Bur. Tech. Paper No. 108
Subjects:	Coal mines and mining. Explosives. Electronic books.
Online Access:	Connect to the full text of this electronic document