In 1982 these 2 organizations merged to become America's largest single provider of managed health-care coverage
[DOC] [TLE] LabCorp: Company History [PAR] In 1983, Hoffmann-La Roche merged all of its laboratory companies into one ... 
adopted the name National Health Laboratories Incorporated (NHL) in 1974, and 
... merged to become one of the largest clinical lab providers in the world.