cased handset wall telephone for use in CBS No 1, 2, 3 & Magneto areas and
on long lines in CB & Auto areas on extension plans.
Fitted with a DC Trembler bell and has provision for three buttons.
Circuit diagram N493.
History, Technical and General Information on 300 type telephones
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Keys for use in 300 type Wall and Table Telephones
How to restore Bakelite