MOBIL , BP, TOTAL , SHELL , EXXON , RHONE-POULENC , ARKEMA , SANOFI , SEP , FOSTER WHEELER , JOHN BROWN , TECHNIP , JACOBS, LURGI , SOFREGAZ , SOFRESID , LINDE , ALSTOM , THERMODYN , AIR LIQUIDE , VEOLIA , SOLVAY , DRESSER , GEA , BTT , HAMON , ASTRA Refrigeranti, STERLING-SIHI, PROSERNAT