AKZO

BASF

Bayer

Boehringer Ingelheim

Bosch

Ciba-Geigy

Degussa

DOW

DUPONT

ELF Tanklager

Exxon

  Festo

  Henkel

  Hoechst

  Infraserv

  Mannesmann

  Linde

  SAMSON

  Shell

  Siemens

  Thyssen Krupp

  Wacker Chemie