李纪元

One kind of fine trailing suction hopper dredger excavation control method

杨巍, 许向东, 韦纪军, 2013 .

Bidirectional safety tongs for elevator

李刚, 王锐, 李纪元, 2000 .

Two-in-one limiter test platform and test method for determining speed and force

李纪元, 李增健, 2007 .

Fine dredging control method for trailing suction hopper dredger

杨巍, 许向东, 韦纪军, 2013 .