1. (1) “History of Product Nationalization of Electrical Technology in Japan”, Technical Report, IEE Japan, No. 603, pp. 3-10, pp. 33-41 (1996) (in Japanese)
2. (2) K. Yoshizumi and K. Tanaka : “History of Manufacturing Nationalization of Power Circuit Breakers in Japan”, The Papers of Technical Meeting, IEE Japan, No. HEE-95-16, pp. 93-104 (1995) (in Japanese)
3. (3) K. Yoshizumi and K. Tanaka : “History of Manufacturing Nationalization of High-Voltage Circuit Breaker Technology”, The Papers of Technical Meeting, IEE Japan, No. DIH-6-5, pp. 93-104 (1995) (in Japanese)
4. (4) History of Substation Technology in TEPCO, Tokyo Electric Power Co. (1995-3) (in Japanese)
5. (5) Product Catalogues by Hitachi, Toshiba, Mitsubishi Electric & Meidensha (in Japanese)