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DeviceMaster ® Serial Hub 8-Port - Pepperl+Fuchs Comtrol
StarTech.com USB to Serial Adapter Hub - 8 Port - DB9 (9-pin) - USB Serial - FTDI USB to RS232 Adapter - USB Serial - Add eight RS232 serial ports to any
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Buy Wholesale China 3 Ports Rs232 Hub To Usb 3.0 Serial Extender Cable & Rs232 Hub Cable at USD 6.8 | Global Sources
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4-Port USB to Serial RS232 Hub | TRENDnet - TRENDnet TU-S4
StarTech.com ICUSB23216F 16-Port USB to Serial Adapter RS232 Hub FTDI Rackmount 65030864763 | eBay