English: Automatic telephone instrument type 135 AT (for Automatic Table). This specimen has code letters on circular card, reflecting the way numbers were listed in the phone book pre-1960. So JM-4272 was later listed as 46-4272. In South Australia the JM (or 46) signified that the subscriber was cabled to the Croydon telephone exchange. That telephone number was unique within South Australia, but not within Australia.
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