NATIONAL TELEPHONE COMPANY
B580

BATTERY INTERCOMMUNICATION TELEPHONES

WALL SET

Pattern No. B580

Comprises - Hand Combination Transmitter and Receiver, fitted with Ringing and Speaking Key, Cord, Bell and Line Selector.

An advantage in connection with these Sets is that a common battery of three or four cells provides the current required for both ringing and speaking.

The terminals are so arranged that the connections may be made on either back or front.

Produced in 5 & 10 line models.

This was model B77 in the 1903 catalogue, which catered for 5, 10. 15 and 20 lines.

 
 
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