Automatic power releases for shutting off power from mine and indicating by signal alarm when fan stops or doors are left open.

Bibliographic Details

Other Authors:	Dalrymple, R. F., Fene, W. J. (William Joseph), 1891-
Format:	Government Document eBook
Language:	English
Published:	Washington, D.C. : [publisher not identified], 1930.
Series:	Mines Bur. Info. Circ. No. 6288
Subjects:	Ventilation. Electronic books.
Online Access:	Connect to the full text of this electronic document