Ralph D. Ketchum

Oglebay Norton Co. LLC engages in mining, processing, transporting and marketing industrial minerals and aggregates. It provides aggregates and industrial minerals for applications in the building materials, environmental, energy and industrial markets. The company operates in three segments: Great Lakes Minerals, Global Stone and Performance Minerals. The Great Lakes Minerals segment mines and distributes limestone from facilities located in northern Michigan. The Global Stone segment supplies lime, crushed and ground limestone, construction aggregates and chemical limestone in the Great Lakes region. It's products are used as a filler in building materials, waste water treatment and soil stabilization and as an aggregate for construction of highways, shopping centers, hospitals and schools. Performance Minerals segment mines and processes industrial sands. The company was founded in 1854 and is headquartered in Cleveland, OH.

Thomas Industries Inc. manufactures blowers, compressors and vacuum pumps. Its products are claw, diaphragm, linear, peristaltic, piston, radial, rotary lobe, rotary vane, screw and side channel products for use in global OEM applications. The company was founded by Lee B. Thomas Sr. in 1953 and is headquartered in Milwaukee, WI.