- 2002 - 2007 Tokyo University of Science, Suwa
- 1996 - 2002 Tokyo University of Science, Suwa College
- 1996 - 2002 Professor, Science Univ. of Tokyo, Suwa
- 1996 - 2002 Professor, Science Univ. of Tokyo, Suwa College
- 1989 - 2002 Senior Researcher, Device Development Center, Hitachi Ltd.
- 1989 - 1996 日立製作所デバイス開発センター研究員
- 1978 - 1989 日立製作所武蔵工場主任研究員
- 1978 - 1989 Senior Researcher, Musashi Works, Hitachi Ltd.
- 1967 - 1978 日立製作所中央研究所研究員
- 1967 - 1978 Researcher, Central Res. Lab., Hitachi, Ltd.
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