This utility model comprises two outer bound edges, two inner bound edges and an inner tower, characterized in that the said outer bound edges are provided with a coupler plug;
本实用新型包括两个外包边、内包边和内架,其特征在于所述外包边的内端设有连接插头;
a conception to add anticreep device on top locklift plug of 13a top operation coupler
关于13A型上作用式车钩上锁销加装防跳机构的构想
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