... ,SGS,country patents 1>Double frequency induction heating machine XS-80 technique data:1. type:XS-180-120B2. input voltage:three phase ... , etc. 8.Digital auto-control, it has the function of manual, automatic and heating-keeping-cooling divide period to control. 9 ... .>.Feature:1)digital auto-control, it has the function of manual, semi=auto,full-auto, heating-keeping-cooling device period to ...