- 1992 - 1998 The University of Electro-Communications
- 1992 - 1998 The Univ. of Electro-Communications,
- 1986 - 1992 The University of Tokyo The Faculty of Engineering
- 1986 - 1992 Univ. of Tokyo, part-time professor
- 1975 - 1985 The University of Tokyo The Faculty of Engineering
- 1975 - 1985 Univ. of Tokyo, part-time professor
- 1956 - 1985 鉄道技術研究所 技術員・研究員・主任研究員・室長
- 1956 - 1985 Railway Technical Research Institute ;
- 1964 - 1976 Tokyo Denki University
- 1964 - 1976 Tokyo Denki Univ., part-time professor
- part-time professor
- chief researcher
- engineer, researcher, senior researcher,
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