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If you’re a coffee drinker, there’s a good chance you’ve had a cup of S&D Coffee and don’t know it. The Concord-based company supplies McDonalds, Dunkin Donuts, Circle K, and Krispy Kreme, among others, with coffee, tea, and creamers. S&D has over 600 employees in the state and now plans to add another 200 to that count.