BC 331
Telephone set for extension use. Table telephone model M33 of Bakelite with reduced casing without built-in bell, finger disc of nickel-plated brass, textile-covered cord connected to wall terminal with black lacquered metal cover.

The Danish Telegraph Agency has defined the following new types of apparatus: Telephone set BC 321, CB extension and Telephone set BC 331, AT side set.  These two types of apparatus are intended to replace the CD 567 micro switchboard for CB telephones and microphone exchange CD 568 for AT telephones.

The BC 321 can be used as an auxiliary device for all CB terminals in use (i.e. BD 360 and BC 300 model 1908 and model 1925).

BC 331 can be used as an extension to all AT terminals established so far (i.e. BD 370, BC 310, BC 316 and BC 330). If, in the case of a new installation of an auxiliary unit, the terminal unit is not a Bakelite model the latter may not be replaced for this reason.

Dated 1933.

Diagram - 402587.

Ericson model - DBK 21X02.

Made by KTV.

KTV

Ericsson

Last revised: July 23, 2025