... one of the key manufacturers of open back presses of the country and is charged with the ... , J23. KZ25, J21S, JZ21G, JZ21K, JZ31, JZ36 series presses, total up to more than 60 models, enjoy high reputation ... rights of foreign trade, Its ZDM brand mechanical presses are awarded the name brand products of Zhejiang province ... level laboratory of mechanical press testing. JS21 series open-type servo press