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Enhanced 4K on Xfinity: What’s New and How to Watch
X1 TV Box equipment types - Xfinity Support
Xfinity X1 Review | Cost, Features, & More | CableTV.com
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Comcast Xfinity X1 DVR Review
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Comcast To Launch 4K Ultra High-Definition Set-Top Box
Xfinity Flex - Comcast Corporation