机械剥牛皮刀
生产线上剥牛皮联合机

skinner cattle foot skinner hide skinner mule skinner wire skinner mechanical emaciated cattle cattle insurance pedigree cattle cattle plague skinner cattle Skinner solution mule skinner wire skinner Skinner's line Skinner box Skinner's box Skinner's chloroform drop bottle simple skinner box Skinner' s classification mechanical