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USB to RS232 Hub (4-Port / Industrial) – CommFront
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4 Port Professional RS-232 USB 2.0 to Serial Adapter
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FTDI Serial USB RS232 Adapter 4 port Din Rail Industrial - Shentek
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StarTech.com 8 Port Serial Hub USB to RS232/RS485/RS422 Adapter, Industrial USB 2.0 to DB9 Serial Converter Hub, IP30 Rated, Din Rail Mountable Metal Serial Hub, 15kV ESD Protection - 6ft Locking Cable
