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Amazon.com: U.S. Robotics 5686G Data/Fax Modem - Serial - 56 Kbps "Product Category: Modems/Analog Modems" : Electronics
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NeweggBusiness - U.S. Robotics USR5670 Fax modem 56Kbps PCI Bus (Plug & Play) V.92 56K ITU standard V.90 56K ITU standard V.34 33.6K ITU standard Compatible with most ITU and Bell standards
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