After 21 years running their own company, Mark and Cindy Knight know a thing or two about keeping a small business humming along. They are the third owners of Bill's Service in Knox, Pa., which they bought after Mark had worked for the previous owner.They have about 500 restrooms, about 80 percent from PolyJohn Enterprises and the rest a mix from Satellite Industries and PolyPortables, Inc. and cover 14 counties in rural northwestern Pennsylvania, about 70 miles east of Youngstown, Ohio, and about 90 miles northeast of Pittsburgh. The economy is steady but not spectacular, Cindy Knight reports. The area
