Menu Expand Menu Close
Back to Top
Filter Search Expand Close Filter
Search Expand Search Close

1. Some signaling systems in metal-mine shafts.

Creator Personal:
Mosier, McHenry., Gleim, E. J. (Ernest J.)
Title:
Some signaling systems in metal-mine shafts.
Call Number:
P19470
Date:
1939
Description:

Serial issue. Issued as: United States. Bureau of Mines. Information circular, 7083 (1939:June).

Subject Topical:
Mine safety., Signals and signaling., Mine communication systems.
All:
Signals and signaling., Mine communication systems., Mine safety.