Nippon TV was launched in 1953 as the first commercial television station in Japan and and given right to broadcast color television 7 years later. On April 1, 1966, Nippon TV formed a spin-off 24-hour news station called Nippon News Network (NNN), and formed the Nippon Television Network System (NNS) in 1973.
Involvement with Doraemon
This TV station aired the Doraemon 1973 anime. For more information, see Doraemon (1973 anime)