Potbelly Sandwich Works, which has Starbucks chairman Howard Schultz as an investor, is pushing for a 20% location growth in 2007 after rapidly reaching 160 shops in 10 states. The brand's concept started in the late 1970s around a potbellied stove in an antiques shop, and as the company expands, it may have problems maintaining the mom-and-pop methods that make it popular, such as in-store sandwich meat slicing and milk shakes made from scratch.

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