... biggest manufacturer of cold heading header for bimetal contact rivets in China, biggest output worldwide Manufacturer: Liuzhou Wantong Electromechanical ... machine,3. overwhelming bigger share in home market, 4. supply capacity: around 500 sets each year, biggest co. and biggest output ... cut the material YFC-30 Cold Heading Machine for Bimetal Contact Rivets, Bi-Metal Contact Rivet Manufacturing ...