 In 1977 TTV Radio and Thailand Color Television Channel 9 moved to the present Huai Khwang headquarters in Bangkok and merged to form the Mass Communication Organization of Thailand (MCOT).In 1970, with the launch of Chong Sam (Channel 3;Defunct in 2020), its newest station, while the original Thai Thorathat (Channel Four) network was renamed Chong Kao (Channel 9).Witthayu Tor Tor Tor ("TTV Radio") later became Radio MCOT on 25 March 1977 and became the nation's first 24-hour radio station.