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2-Port USB to RS-232 Hub - UC2322 – ATEN USA
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
8 Port USB to Serial RS232 Adapter Hub - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com
4-Port USB to RS-232 Hub - UC2324, ATEN Converters | ATEN U.S.A.
2-Port USB 3.2 Gen 1 Industrial Surface & DIN-Rail Mount Hub w/ Gigabit Ethernet & DB9 Serial FTDI Chipset