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Plastic PCB Jumper Box, DB9 Male / Female - DJB9MF
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4Port PCIe RS232 Serial DB9 Adapter Card - Serial Cards & Adapters | StarTech.com
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DB25 25 Pin Check Tester/ Loop Back Tester/ Mini Tester/ Jumper Box Serial RS232 | eBay
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MAX3232 RS232 Serial Port To TTL Converter Module DB9 Connector W/ 4 Jump Cables 4894462108147 | eBay