mitsui seiki high precision jig grinder model 4gdn with ultra-precision accuracy operations provides efficiency grinding of exotic materials, fine cermics, carbide and conventional materials that demand jig grinding toler......mitsui seiki high precision jig grinder model 4gdn with ultra-precision accuracy operations provides efficiency grinding of exotic materials, fine cermics, carbide and conventional materials that demand jig grinding tolerances. integrated circuit logic, closed loop, complete electrical equipment for operation on 3-phases 50/60hz 200/220 volts ac