... easy to operate, high safety and reliability, green press creating more value for user Zhejiang Metalforming Machinery Group ... company is one of the key manufacturers of open back presses of the country and is charged with ... J23. KZ25, J21S, JZ21G, JZ21K, JZ31, JZ36 series presses, total up to more than 60 models, enjoy ... a state-level laboratory of mechanical press testing. JS21 series open-type servo ...