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StarTech.com 4 Port USB to Serial RS232 Adapter - DB9M - RS232 Extension - Serial to USB (ICUSB2324) - serial adapter - USB - RS-232 x 4
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StarTech.com USB C to Serial Adapter Cable 16" (40cm) - USB Type-C to Serial RS232 (DB9) Cable Converter - Male/Male - Windows/Mac/Linux - Portable USB Type-C to male serial RS232 DB9 adapter
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