SB-100
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Control Switchboard SB-100/MTC was semiautomatic equipment used for quickly grouping field telephones of a network for alerts, conferences, and instructions. It was usually mounted atop the administrative switchboard. This equipment, consisting of the switchboard component and a handset, had no means for ringing and signaling.
Reference File
- TM 11-2133 Control Switchboard SB-100/MTC