NATIONAL TELEPHONE COMPANY
B510

BATTERY INTERCOMMUNICATION TELEPHONES

WALL SET

Pattern No. B510

Comprises - Hand Combination Transmitter and Receiver, Cord, Fixed Cradle, Induction Coil, Bell, Push Button and Line Selector.

The connections in this pattern instrument are all enclosed, but easily accessible without removing the instrument from the wall.

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

Last revised: November 17, 2025