BATTERY INTERCOMMUNICATION TELEPHONES
Pattern No. B520
Comprises Hand Combination Transmitter and Receiver with Double Contact Key, Cord, Fixed Cradle, Induction Coil, Bell, Push Button, and Line Selector.
A special feature with this instrument is, that while all the connections are entirely enclosed, they are easily accessible without removing the instrument from the wall, the terminals being mounted on the backboard upon which the front of the instrument is hinged.
5, 10, 15, 20, 25 & 30 line models.