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USB to 4-Port RS-232 DB9 Serial Interface Adapter - Sealevel
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4-Port USB to RS-232 Serial Adapter Hub
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4-Port Industrial USB to RS-232 Serial Adapter Cable
4-Port USB to RS-232 Serial Adapter Hub
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USB 4-Port Serial Adapter - USB 2.0 to DB-9 Port RS232 with FTDI CHIP - Coolgear
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Amazon.com: StarTech.com 4 Port USB to Serial RS232 Adapter - Wall Mount - Din Rail - COM Port Retention - FTDI USB to DB9 RS232 Hub (ICUSB2324I) : Electronics
4-Port RS-422 / 485 USB to Serial Adapter - Coolgear
4 Port Serial - USB Cable - Get Console Shop
USB 4-Port Serial Adapter / USB 2.0 Quad Port Serial DB-9 RS-232
