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Definition Manual Telephone Switchboard

An item consisting of a framework or inclosure on or in which are mounted switches, relays, indicator lamps, and/or drops, wiring, fuses, line and trunk terminations. May include dial. Provides for manual connection of a calling telephone set or trunk to a called telephone set or trunk. Connections are usually made by means of plugs, jacks, and cords, or by key type switches. May include means for signalling and supervision. May be of the multiple or nonmultiple type, and may be sectionalized.