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Patent applications and USPTO patent grants for China Railway No.3 Engineering Group Co., Ltd.The latest application filed is for "construction method for making water-rich sand layer shield over cross existing line and underneath cross sewage push pipe at close range".
Patent | Date |
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Construction Method For Making Water-rich Sand Layer Shield Over Cross Existing Line And Underneath Cross Sewage Push Pipe At Close Range App 20210301660 - LI; Gangzhu ;   et al. | 2021-09-30 |
Method For Installing Steel Tube Arches App 20210164176 - Zhang; YUGEN ;   et al. | 2021-06-03 |
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