DeWitt, NY - A company that specializes in redeveloping old industrial sites has purchased the former Oberdorfer foundry on Thompson Road and plans to demolish it. Northern Industrial Holdings LLC, of Delaware, acquired the 230,000-square-foot foundry and the 17.5-acre property it sits on July 24, said Christopher Westfall, a sales agent with Pyramid Brokerage Co. He declined to disclose the purchase price.…