STEELS PRETREATMENT THREAD ROLL-TABLE CONTINUOUS SHOT BLAST MACHINE FOR STEEL PLATE ROLL-TABLE CONTINUOUSLY PASSING TYPE DESCALING MACHINE FOR STEEL STRUCTURE STEPPING-PASSING TYPE SPRAYING TYPE DESCALING MACHINE STEEL PLATE FINISHER LARGE STEEL PIPE SHOT BLAST MACHINE LARGE AND MEDIUM SIZE STEEL PIPE SHOT BLAST MACHINE STEP IN TYPE SHOT BLASTING MACHINE MULTIHOOKS CIRCLE-ELEVATOR SHOT BLASTING MACHINE HOOK CONTINUOUS SHOT BLASTING MACHINE