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Giant variable diameter TBM unveiled in China's Changsha
China Railway Construction Heavy Industry Co., Ltd. new tunnel boring machine
https://english.news.cn/20230422/7ed79e8c39714fc38321b52f41b78815/c.html
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https://english.news.cn/20230422/7ed79e8c39714fc38321b52f41b78815/c.html
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