1. Met-Pro to begin trading on NYSE
2. Aventis ADSs start regular trading on NYSE Executive Committee Members Name Former Position/Company Position within Aventis Richard Markham Hoechst Marion Roussel, Chairman of Management Board CEO of Aventis Pharma Jurgen Dormann (chairman) Hoechst, Chairman of Board of Management Chairman of Management Board Alain Godard Rh�ne-Poulenc Plant and Animal Health, President CEO of Aventis Agriculture Klas Schmieder Hoechst, CFO Chief Administrative Officer Rene Penisson Rh�ne-Poulenc, Director of Human Resources Chief Human Resources Officer Patrick Langlois Rh�ne-Poulenc;Hoechst shareholders meeting to approve the special dividend December 15,1999