From 1976 to 1978 STD (subscriber trunk dialing) was introduced. STD let telephone users make national and international calls without going through an operator. Installing STD equipment was a time-consuming business. The Wellington exchange contained 23 units that took the equivalent of 75 man-years to install.
Courtesy of Telecom
Using this item
Alexander Turnbull Library
Reference:
Eph-A-TELEPHONE-1976-01-front; Eph-A-TELEPHONE-1976-01-inside
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