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USB to 4-Port RS-232 DB9 Serial Interface Adapter - Sealevel
4 Port Serial RS-232 Hub w/ FTDI Chipset & RX/TX LED Indicators
4-Port USB-A to Serial DB9 Adapter, Keyspan | Eaton
4 Port Serial RS-232 Hub w/ FTDI Chipset & RX/TX LED Indicators
4 Port Professional RS-232 USB 2.0 to Serial Adapter
4-Port USB to RS-232 Serial Adapter Hub
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Q Core Medical Sapphire USB to 4-Port RS232 Adapter | Bound Tree
