Tripp Lite Keyspan High Speed 4 Port USB to DB9 Serial Adapter Hub - serial adapter - USB - RS-232 x 4 - USA-49WG - USB Adapters - CDW.com
Tripp Lite Keyspan High Speed USB to Serial Adapter - serial adapter - USB - RS-232 - USA-19HS - USB Adapters - CDWG.com
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Amazon.com: Tripp Lite Keyspan High Speed USB-C to Serial Adapter DB9 RS232 Cable, 3 Feet / 0.91 Meters, Windows Server & MacOS Compatible, 3-Year Warranty (USA-19HS-C) : Electronics
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Tripp Lite Keyspan High Speed USB C to Serial Adapter DB9 3ft USB Cable TAA (USA-19HS-C) USB Converters - Newegg.com
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