Oct. 10—JANESVILLE — A Janesville-born company that for years has been the nation's biggest player in waste-oil-burning furnaces is now owned by a St. Louis private equity firm. Rock Energy Systems, ...
A Janesville-born company that for years has been the nation’s biggest player in waste-oil-burning furnaces is now owned by a St. Louis private equity firm. To view our latest eEdition, click the ...