The US Army Signal School apprenticeship program for the trade of central office telephone installer and repairer.
|Corporate Author:||United States.|
Washington, DC : Headquarters, Dept. of the Army, 
U.S. Army Signal School
U.S. Army Signal School /
Telephone systems > Telephone systems / Maintenance and repair.
"15 July 1981."
"This pamphlet supersedes DA Pam 621-63, 15 April 1979."
9 p. in various pagings ;
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