1989-
1991
- Start of construction and maintenance and operation services of high power very low frequency (VLF) transmitting equipment
- Building of the Shiga Plant (currently leased to Denko Techno Heat Co., Ltd.), and expansion of high-frequency induction heating services
- Start of mobile telephone base station antenna manufacturing
1992
- Start of sales of electron shower apparatus
- Technical cooperation with Germany’s ALFING and start of sales of follower crankshaft hardening equipment
1994
- Beginning of PHS base station antenna manufacturing
- Opening of the Tokai Techno Service Center to expand IH Heat-Treatment Processing services. (The Tokai Techno Service Center is currently leased to the Kariya Plant of Denko Techno Heat Co., Ltd.)
- Start of sales of the thin slab induction heating system
1997
- Closure of the Yosami Radio Transmitting Station, ending 70 years of service
- The Kawagoe Office and the Kawagoe, Kanuma, and Atsugi plants all receive ISO-9000s certification (quality control system)
1999
- Contract for construction of joint testing digital terrestrial broadcasting antenna for seven areas in Japan
