Australian Post Office
Telephone No. 312
Telephone, Shared Service and Duplex lines, Table

The Telephone No. 312AT was produced for duplex services.  It had a push button mounted in front of the handset with a label reading "Call Exchange".

A similar phone with a pushbutton marked "Ring" was used as an extension phone off a switchboard or intermediate telephone.  A version with three pushbuttons marked "Main Extn , Extn Exch, Main Exch" was a replacement for the old Teleintermediate and JS&B intermediate telephones.  These phones were issued under Serial/Item numbers, but do not appear to have been given a 300 model number.

Taken from Bob's Old Phones
 

 

 
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Last revised November 24, 2024

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