Tesla ESS SZ82

Year of manufacture: 1982/90
Manufacturer: Tesla Liptovský Hrádok

Office assistant set for five users (the Director, the Secretary and three Deputies). This phone belonged to the Deputy no. 2. The users could communicate with each other or use six external lines - one for all users, two for the Director and the Secretary and one for each Deputy. Also a conference call between two users and one line was possible. The set used a main control unit placed inside a wall box that contained quite complicated electronics with relays and TTL circuits. A "Do not enter" door warning light, which would turn on during a call, could be connected to each phone. The phones also offered loud listening over an external speaker and a tape recorder output.