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AERA
BP Amoco
Brenttagg
Citgo
ConocoPhillips
Diamond Shamrock
DuPont/Invista
Ethyl
ExxonMobil
Kinder Morgan
Koch Industries
LWD Field Services
Lyondell Basel
Lyondell Citgo
MCS Technologies
Motiva
Marathon Petroleum
Marisol
Motiva
Onyx
PASA, Mexico
Phillips Service Company
Rhodia
Rohm&Haas
Solutia
Sterling Chemicals
Shell Oil
Total Refining
United Refinery
Valero |
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