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L. M. ERICSSON
TELEPHONE HA 250
TELEPHONE - WALL
INTERCOM TABLE TELEPHONE
Self-selecting table telephone sets for dual lines with galvanic signal

HA250 (Old No's 771, 772 and 773)
 Intercommunication telephones of different models catering up to 50 stations.

The telephone consists of:
Polished walnut stand.
Horizontal microphone RE 3000 with telephone cord RS 8001.
Wall mount with wall mount cable.
Selector switch.
Push button for the release of the signal.
Bell with 100ohms resistance.

Based on the incoming signal, the phone's bell rings regardless of which number the switch is set to.  When the signal arrives, the switch is turned to the position marked A, after which calls can take place.

If you wish to talk to one of the other devices from one device, you set the switch to the number of the device in question and give a signal with the push button.

These devices can also be used for single lines.

The picture to the right shows the HA 250/15 station model.

Catalogue No. Stations
HA 250/10 10
HA 250/15 15
HA 250/20 20
HA 250/30 30
HA 250/40 40
HA 250/50 50

Taken from the L. M. Ericsson Telephones and Signalling Material Catalogue No. 122 (1930) - Swedish Translation

Also found in the Ericsson Catalogue 7th Edition (1923)

HA 250/30

 

 

 
 
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Last revised: April 24, 2024

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