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GFF CANADA LTD

LTPN

O M V TRADING SERVICES LTD

BP P.L.C.

INSTRUMENT PRODUCT SERVICES LIMITED

TULLOW OIL PLC

SIP LTD

MODEL TECHNICS LIMITED

SASOL CHEVRON CONSULTING LIMITED

PETRO-CANADA ENERGY NORTH SEA LIMITED

CONOCOPHILLIPS HOLDINGS LTD

EASTHAM REFINERY LIMITED

OMV (U.K.) LTD

BP EXPLORATION COMPANY (COLOMBIA) LTD

CONOCOPHILLIPS PETROLEUM COMPANY U.K. LIMITED

W.J.CURLEY & SONS LIMITED

SIGMA EXPLORATION LTD

ENI LASMO PLC

FMC/KOS WEST AFRICA LIMITED

PETRECO INTERNATIONAL LIMITED

CNR INTERNATIONAL (U.K.) LIMITED

SHELL INTERNATIONAL PETROLEUM CO LTD

AIR B P LTD

WESTERN STANDARD LIMITED

UNIPEC U.K. CO. LIMITED