Focus on Lewiston-Auburn piece on WahlcoMetroflex Inc of Lewiston, a company t

Focus on Lewiston-Auburn piece on WahlcoMetroflex Inc of Lewiston, a company that manufactures air pollution and gas-flow control equipment for power plants and other facilities. President and CEO John Powell says revenue has grown 300 percent in three years, largely in thanks to the federal Clean Air Interstate Rule of 2005. The company was bought out of bankruptcy seven years ago, and last year was named the Maine Small Business Exporter of the Year. With a history of the company and a look at its expansion plans