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
Seismic detection of trapped miners using in-mine geophones
A low-cost FSK modem network for polled communication systems
Refine your search results
Published Year
1970-1979 (1)
1980-1989 (1)
Subject
Mine communication systems (2)
Mine safety (1)
Modems (1)
Author
Watson, Richard A., (2) *
Powell, James A. (1)