System 142 is a Telephonic Switchboard System for internal communication only. Specifically engineered to provide instant two-way communication between a switchboard control station (usually operated by a doorman or concierge) and one or more handset stations. Nine standard models are available from 10 to 120 lines capacity, (models with additional lines are available upon request). The 142 can be used for apartment, commercial, industrial, professional and emergency applications.