'Radio Corporation of New Zealand' branded equipment was manufactured by Radio Corporation of New Zealand Ltd, they were distributed by Columbus Radio Centre Ltd. Currently there are 13 documented models.

Radio Corporation of New Zealand Ltd, besides manufacturing radios under many brands including Columbus, Courtenay, Stella, Pacific, CQ, Acme, Troubadour etc also manufactured specialty products such as test equipment for servicemen, radio equipment for amateur radio, transmitters and large-scale installation equipment for radio and intercom installations in businesses and apartment buildings. 

Generally this equipment was just marked with its name and 'Manufactured By Radio Corporation of New Zealand Ltd.' or in some cases manufactured by the Special Equipment Divison.

This is the listing of their special equipment products - If you are looking for Radio Corp NZ radios, try here

13 Documented Radio Corporation of New Zealand Models