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USA-49WG TRIPPLITE TRIPP LITE 4-PORT SERIAL RS-232 DB9 MALE TO USB HUB - NEW | eBay
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2 Port USB 2.0 to Serial Adapter Hub - Serial Cards & Adapters | StarTech.com
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USB to RS232 Hub (4-Port / Industrial) – CommFront
4-Port USB to RS-232 Serial Adapter Hub
