- 1974 - 2003 Tokyo Keizai University
- 1974 - 2003 Professor, Tokyo Keizai Univ.
- 1968 - 2000 Chuo University Faculty of Law
- 1968 - 2000 Chūō Univ., Lecturer
- 1972 - 1973 The University of Tokyo Institute of Social Science
- 1972 - 1973 Institute of Social Science, tokyo Univ., Lecturer
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