skip to content
Search
Search U.S. government technical reports digitized or harvested by
TRAIL
.
Keyword Search
Enter your search term(s):
[advanced search]
2 results returned
Browse TRAIL Inventories
(opens in new tab)
Search results
An electromagnetic system for detecting and locating trapped miners
Seismic detection of trapped miners using in-mine geophones
Refine your search results
Published Year
1970-1979 (2)
Subject
Mine communication systems (2)
Mine safety (2)
Author
Powell, James A. (2) *
Watson, Richard A., (1)
