在原有螺杆式、卷扬式和液压式启闭机的基础上，设计研制了齿销式启闭机。
On the basis of original screw type, winding type and hydraulic type Headstock, a kind of dentate annul headstock is designed and manufactured.
在原有螺杆式、卷扬式和液压式启闭机的基础上，设计研制了齿销式启闭机。
On the basis of original screw type, winding type and hydraulic type Headstock, a kind of dentate annul headstock is designed and manufactured.
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