Early Key Systems Telephones, Such as 1A1 and 1A2

The 1A2 system was very typical and leased for many decades. These systems consisted of central control units and a number of specialized telephone sets.  Lights at the bottom of the dial indicated the following:

• Lamp off — The line is idle

• Lamp steady on — The line is in use for a call

• Lamp flashing slowly — The line is ringing with an incoming call

• Lamp winking fast — A call on the line is "on hold"

302 Key Telephone	Call Director

Please stay tuned for pictures of more business sets.  In the meantime, please click here to schedule a tour and see the many business telephones and switchboards, including a Braille switchboard used at the Lighthouse for the Blind in Houston.