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PlayStation 4 - Wikipedia
PlayStation 4 technical specifications - Wikipedia
The (Mostly) Complete History of the PS4 - IGN
PlayStation 4 Model Guide: PS4 Model List and Comparison
All PlayStation Console Models & Generations in Order of Release
History of PlayStation 4 - PlayStation 4 Guide - IGN
Every PlayStation Console: A Full History of Release Dates
PlayStation 4 500GB Console [Old Model][Discontinued]
PS4 Consoles for Sale - New & Used Playstation 4 Consoles - eBay
Tech Specs (US) - PlayStation