Design of ditching machine fitting with walking tractor 手扶拖拉机配套开沟机的设计
2.
Field operation quality of ditchers 田间开沟机械作业质量
3.
Underground mining machines - mobile extracting machines at the face - safety requirements for shearer loaders and plough systems 地下采矿机械.工作面上的移动式采掘机械.截装机和开沟机系统的安全要求