Schering Corporation become a global research-based pharmaceutical firm in the 1950s and '60s based on both research and development and acquisitions.

CNN: Schering-Plough facts

Schering Corporation was established in the late 1800s as the U.S. subsidiary of Schering AG, a German-based pharmaceutical and chemical company.

CNN: Schering-Plough facts

Schering Corporation was nationalized by the U.S. government during World Wars I and II, and in 1952, the company passed into the private sector.

CNN: Schering-Plough facts