Guidelines for Installation, Maintenance and Inspection of Mine Telephone Systems.
NTIS: PB/287-641 Available for Reference At Bureau Libraries :53 pages
This report reviews installation, maintenance, and inspection of mine pager telephone installations. Certain commercial telephone test equipment was modified and a tone source and switching circuit were developed for use in the testing of mine pager phone systems. Descriptions are included of the modifications to a commercial test set and of a tone source-switching unit.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/287-641 Available for Reference At Bureau Libraries
A. D. Little, Inc.