The leads of a test telephone are held to terminals in a line equipment number block, Jan. 27, 2017, in the 88th Communications Squadron Telephone Repair Shop for Area A of Wright-Patterson Air Force Base, Ohio. The 1ineman’s test set was used to check for a dial tone as technicians worked to troubleshoot a problem. (U.S. Air Force photo by R.J. Oriez/Released)
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