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4-Port USB 3.0 hub | Belkin
USB 4-Port Serial Adapter - USB 2.0 to DB-9 Port RS232 with FTDI CHIP - Coolgear
Adapter USB-COM-Port (RS-232, seriell) Converter
Amazon.com: SmartQ H302 4-port USB 3.0 Hub with 1ft Long Cable, Multi USB Port Expander with Micro-B Charging Port, Fast Data Transfer USB Splitter For laptop, Compatible with Windows PC, Mac, Printer,