The story
Toho Gas was initially founded to the Toho Electric Power Company (東邦電力) in 1922, as a result of the merger of two electric power companies, Kansai Denki and Kyushu Dentō Tetsudō. Following the merger, the company decided to spin off the gas business and acquisition of the Nagoya Gas Corporation.
Timeline
June 26, 1922, Toho Gas was founded by acquiring business of Nagoya Gas.
March 1927, Toho Gas acquired business of Saibu Gas Group in Fukuoka.
December 1930, The gas business in the Northern Kyushu region was transferred to Saibu Gas Corporation.
April 2003, Toho Gas merged with Gōdō Gas, Gifu Gas Corporation, and Ōgaki Gas.
From Wikipedia’s article on Toho Gas, shared under CC BY-SA 4.0.5