SWEDISH ERICSSON |
TELEPHONE No. DE 400
TELEPHONE - WALL
For Automatic telephone systems
Small extension model without bell.
This telephone is designed for use with types DE and should be placed where the signals on the main telephone may be heard by the person using the extension telephone. Conversation may be carried on in the same manner from either telephone. Calls from one telephone cannot be overheard on the other.
Taken from the L. M. Ericsson Telephones and Signalling Material Catalogue No. 188 (1934)
Last revised: October 12, 2019
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