Type AB 520
Magneto Wall Telephone
FRAMEWORK, polished walnut, constructed to hold two cells, RK 360 or RK 400 (Old No. 971 or 586).
MICRO-TELEPHONE, RE 4050 (Old No. 530), with cord RS 6500 (Old No. 2061), suspended on a hook-switch.
GENERATOR, 3-magnet, RH 3150, which rings satisfactorily through a line resistance of 20,000 ohms.
RINGER, of 300 ohms resistance.
This telephone is fitted with a clip for papers.
Weight, 17.2 lbs.
Taken from the Ericsson Telephone Catalogue 1912
Last revised: September 30, 2019