By Diane Bartz WASHINGTON (Reuters) - Samsung Electronics scored a point on Tuesday over global rival Apple Inc in their long-running battle over mobile device patents. A U.S. trade body found the Silicon Valley giant had infringed on a patent owned by the Korean company and slapped a ban on the sale of certain older iPhone and iPad models sold by AT&T Inc. The U.S. International Trade Commission, an independent federal agency, issued a limited order stopping all imports and sales for AT&T models of the iPhone 4, iPhone 3GS, iPad 3G and iPad 2 3G. ...



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