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M & A | Current Entity | Historical Companies | Aventis
| Fisons, Hoechst, Marion Merrell Dow, May & Baker, Rhone-Poulenc, Rorer, Roussel Uclaf
| GlaxoSmithKline
| Allen & Hanburys, Beckman, Beecham, Burroughs Wellcome, Glaxo, Smith Kline & French
| Novartis
| Biochemie, Ciba, Geigy, Sandoz
| Pfizer
| Agouron, Kabi, Monsanto (Searle), Pfizer, Pharmacia, Upjohn, Warner-Lambert
| Wyeth
| American Cyanamid, Ayerst, Genetics Institute, Lederle, Whitehall, Wyeth
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