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Amazon.com: SERIALGEAR USB 4-Port Serial Adapter/USB 2.0 Quad Port Serial DB-9 RS-232 : Electronics
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Amazon.com: Cable Matters USB to Serial Adapter Cable (USB to RS232, USB to DB9) 3 Feet : Electronics
PWOW USB to RS-232 DB9 Serial Adapter Blue (CH340 Chipset) : Electronics - Amazon.com
