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Amazon.com: [Updated Version] USB to RS232 Adapter Type-C to DB9 Converter Serial Cable for Scanner PC Modem and Printer - High Data Transfer and Compatibility : Electronics
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Amazon.com: SerialGear 4-Port USB DB-9 Serial Adapter Solution for Windows Operating Systems : Electronics
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Amazon.com: StarTech.com 4 Port USB to Serial RS232 Adapter - DB9M - RS232 Extension - Serial to USB (ICUSB2324) : Electronics