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Apple's 21.5-inch iMac gets a new 4K display - YouTube
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Apple rumored to launch a 21.5-inch 4K iMac in October | TechSpot
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iMac 21.5" Specs and Prices - MK142-02
Refurbished 21.5-inch iMac 2.3GHz dual-core Intel Core i5 - Apple
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Refurbished 21.5-inch iMac 2.3GHz dual-core Intel Core i5 - Apple
Amazon.com: Apple iMac MK442LL/A 21.5-Inch Desktop (Discontinued by Manufacturer) (Renewed) : Electronics