Delock Products 61425 Delock Adapter USB 2.0 Type-A > 1 x Serial DB9 RS-232
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Amazon.co.jp: USB to DB9 RS232 Cable Converter, USB 2.0 to Serial Adapter Windows 10/8.1/8/7, Linux, Mac OS (3ft/1 m) and Compatible Prolific PL2303 Chipset, The Hexnuts Male : Computers
USB SERIAL DB9 CABLE 6 PROLIFIC CHIPSET 6FT THUMBSCREWS - Walmart.com
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Rocstor Premium 5ft 1 Port USB to Null Modem RS232 DB9 Serial DCE Adapter Cable with FTDI