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4-Port USB to RS-232 Serial Adapter Hub
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4-Port USB to Serial RS232 Hub | TRENDnet - TRENDnet TU-S4
4-Port USB to RS-232 DB9 Serial Adapter w/ Prolific Chipset
Keyspan RS232 to USB-A Adapter, DB9, 3-ft Cable | Eaton
4 Port Professional RS-232 USB 2.0 to Serial Adapter
4 Port Professional RS-232 USB 2.0 to Serial Adapter
8-Port USB to RS-232 Serial Adapter Hub
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4-Port USB DB-9 Serial Adapter Solution for Windows Operating Systems
