Founded in 1982, Interlock Industries is a privately held company that operates and manages Metal Sales Manufacturing Corporation, Louisville Transportation Company, Ohio Valley Aluminum Company and Altec, which is also known as Aluminum Technologies. Interlock Industries practices in the areas of aluminum casting and extrusion products and transportation. It works with a team of more than 2,000 full-time associates. Its Louisville Transportation Company, which offers emergency and nonemergency ambulance transportation services. Interlock Industries also operates Metal Sales Manufacturing Corporation, which is a metal building component manufacturer that serves the agricultural, commercial, industrial, residential and architectural markets. Interlock Industries and its companies maintain over 20 manufacturing facilities in nearly 15 U.S. states.