Cisco 1905, Cisco 1921, Cisco 1941, Cisco 2901, Cisco 2911, and Cisco 2921 Integrated Services Routers (ISRs) Hardware versions:
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Cisco 1900 Series Integrated Services Router Hardware Installation Guide - Overview of Cisco 1900 Series Routers [Cisco 1900 Series Integrated Services Routers] - Cisco
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