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Dial-up Internet access - Wikipedia
Modem - Wikipedia
Who still uses 56k modems, and why? - TechRadar
56K dial-up modems - USR
Amazon.com: 56k Dial Up Modem
56K* USB Dial-up External Softmodem - USR5639
External USB 2.0 Fax/Data Modem 56K V.92 - StarTech.com
StarTech USB56KEMH2 56K USB Dial-up & Fax Modem - Newegg.com
Zoom - 56K V.92 USB Mini External Data/Fax Modem - Black - Best Buy
USR3453C - Courier® External 56K V.92 Gobal Dial-up Business Modem