A local company in Richland County has been bought by a business in the Cleveland area. RichlandSource.com reports, Mansfield Screw Machine has been purchased by the Swagelok Company out of Solon. Mansfield Screw Machine is based out of Lexington and has about 30 employees. Swagelok says it plans on keeping all of the current employees and adding more in the future. Mansfield Screw Machine was a supplier for the Swagelok Company, who develops fluid systems for gas and oil industries. Mansfield Screw Machine first opened its doors back in 1945.