For the advance of underground utilization technology
～ JTA 50th Anniversary 1975-2025～

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2026.02.27 Exhibition(WTC2026)
2025.05.07 Exhibition(WTC2025)
2024.06.25 Exhibition(WTC2024)
2023.04.07 Exhibition(WTC2023)
2007.06.10 Events
2007.06.07 The JTA

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