SCHERING AG was a research-centered German pharmaceutical company headquartered in Wedding, Berlin. In 2006 it was bought by BAYER AG and merged to form the BAYER subsidiary BAYER SCHERING PHARMA AG. The company was renamed BAYER HealthCare Pharmaceuticals in 2011.
The company introduced a triphasic oral contraseptive called TRIGYNON In assistence to keep track of things, this calculator was associated.