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Base：Langfang anci district, 66 day high road
ADD：Tongzhou District, Beijing Zhangjiawan
Development Zone, West Dingfu Zhuang A 51
Domestic shield machine Lord drive seal production and application of expert commenting was held in Beijing On April 22, 2017, the expert evaluation meeting on the production and application of main drive seal of domestic shield tunneling machine was held in Beijing jiankehuifeng technology co., LTD. Judges by hand in a navigation bureau and Beijing jianke hui feng technology co., LTD.