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    Competition brewing for Green Mt.

    Herb Swanson/Bloomberg
    Green Mountain will lose the main patents on its K-Cups in the fall. Rivals, including Esio Beverage Co., have started to emerge.

    Green Mountain Coffee Roasters Inc., facing an increasing number of rivals for its Keurig machines, fell the most in almost four months after Starbucks Corp. unveiled plans to sell a single-cup coffee system. The Verismo will make espresso-based beverages and brewed coffee, Starbucks said. Last year, Starbucks signed a deal with Green Mountain to sell K-Cup capsules for the Keurig. In September, the Vermont-based company will lose the main patents on its K-Cups, the coffee pods that helped make it the largest player in the US single-serve coffee market.