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Korenix JetCon 1104 USB to 4 RS-232 Serial Converter
4-Port USB to RS-232 Serial Adapter Hub
StarTech.com 4 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 (ICUSB234854I)
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) : Everything Else
4-port USB to RS485 and USB to RS422 converter
Delock Products 87414 Delock USB 2.0 to 4 x serial adapter
Manhattan USB to Serial Converter (151047)
Large Selection of USB-RS232 adapters, Easy Installation and Setup of USB RS232 COM ports.