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
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Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.