DER 1001 (replaces BC 1303)
This telephone has a cover made of black lacquered sheet steel and is equipped with signal button. It is used with another of the same type as a two way intercom system.  The telephones use a battery, preferably composed of three dry cells of 1.5 volts each BKA 1002 or BKA 2002, which serves both as a signal and microphone battery. Suitable battery-box for three cells is BKY 1002.

The distance between telephones is between 200m and 300m if ordinary telephone cable with a conductor with a diameter of 0.8mm - 1mm was used.  This telephone can also be used together with DEK 1001.

Parts:
microphone RLF 1014 made of black Bakelite with microphone capsule RLA 1004, 40ohms, and Cord TRS 1302, 1250mm.
Transformer RCL 10201.
Direct current ringer KLD 1002, 40ohms.
Line cord TRS 1401, 125omm.
Wall bracket NEF 1006.

Dimensions:
Height 166mm, width 115mm.

Weight 1.6 kg.

Taken from the L. M. Ericsson Catalogue No. 610 (1939) - Swedish Translation
 

Last revised: July 23, 2025