G D Searle and Company
1908 - 2000
May and Baker
1839 - 1889
W Martindale
1873 - 1979
Kemball, Bishop and Company Limited
1870 - 1955
Burroughs Wellcome and Company Limited
1880 - 1941
Nutrichem GmbH
1977
Anglo-American Pharmaceutical Company Limited
1892
Thornton and Ross Limited
1922
Merck, Sharp and Dohme Limited
1953