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Kyle Shanahan is already beefing up his defensive line<p>Nine days after being released by the Dolphins, defensive tackle Earl Mitchell has already found a new team to play for.<p>The 49ers announced on Saturday that Mitchell has agreed to terms on a four-year deal. According to ESPN.com, Mitchell’s new …

Read more at CBS Sports: http://www.cbssports.com/nfl/news/49ers-ink-ex-dolphins-defensive-lineman-earl-mitchell-to-a-four-year-deal/