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Past IGTC
- October 1971, Tokyo
- May 1977, Tokyo
- October 1983, Tokyo
- October 1987, Tokyo
- October 1991, Yokohama
- October 1995, Yokohama
- November 1999, Kobe
- November 2003, Tokyo (Report of IGTC '03)
- December 2007, Tokyo (Report of IGTC '07)
- November 2011, Osaka (Report of IGTC '11)
- November 2015, Tokyo (Report of IGTC '15)
- November 2019, Tokyo (Report of IGTC '19)
- November 2023, Kyoto (Report of IGTC '23)