Since 1968, Mark-Line Industries has engineered and built modular structures to accommodate nearly all occupancy types. Headquartered in Bristol, Ind., Mark-Line was founded in June 1968 by L.M. Arnold as a manufacturer of mobile offices for the construction industry. The company has evolved by expanding into permanent and re-locatable modular buildings for commercial, institutional and government applications. It has built classrooms, schools, child day care centers, clinics, banks and credit unions, motels and apartments, jails and prisons, barracks, churches, offices, retail and restaurants.