BELLSET No. 4


Intermediate CB switching Bellset with 4 position switch.

Introduced in 1909 and used on circuits with one extension  giving intercommunication with or without secrecy.

Used on extension plans 5 & 7.

Superseded by Bellset No. 20.

Diagram - N504.

 

 
 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: December 02, 2018

FM