ABSTRACT
According to the kind of clip, it can be separated into two kinds, including bar-spring and shrapnel. The bar-spring clip fastener mainly includes Vossloh by Germany, Pandrol by British and IV type, V type, WJ-7, WJ-8 fasteners by China; and the shrapnel fastener mainly includes the directly-connected fastener and the Nabla fastener by Frence.
