The 1A2 Key Telephone System is a business telephone system developed and distributed by the Western Electric Company for the Bell System. The 1A2 Key Telephone System was a modular system that provided flexible solutions for a variety of telephone service requirements. It provided multiple users with control over multiple telephone lines without the requirement for an operator, system attendant, or receptionist. Each user could select a specific telephone line to place calls on, or to answer calls, and manage those calls by placing them on hold or transferring them to other stations. The system provided options for station-to-station signaling and intercom, and music-on-hold. The control functions were operated directly on each telephone instrument with a set of push buttons (keys) that h