NATIONAL TELEPHONE COMPANY
B520
BATTERY INTERCOMMUNICATION TELEPHONES

WALL SET

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.

Produced in 5, 10, 15, 20, 25 & 30 line models.

This was model B71 in the 1903 Catalogue.

 
 
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Last revised: November 17, 2025

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