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Anhui Preda Machinery Manufacturing Co.,LTD is a professional manufacturer dedicated to machine production； We manufacture auto duct production lines, spiral duct forming machines, CNC plasma cutting machines, pittsburgh lock forming machine, TDF flange machine and so on... We are also the largest sole agent of portable power tools in China, with ample supply. We have enough experience to... Preda Machine is a professional duct machines manufacturer, manufacture auto duct line, spiral duct former, lock former, TDF flange machine. We are also the sole agent of portable power tools in China