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3M COMPANY
AIRTECH SPRAY SYSTEMS, INC.
AJAX TOCCO MAGNETHERMIC CORPORATION
AKZO NOBEL COATINGS INC.
ALLAN EDWARDS, INC.
AMERICAN STEEL PIPE DIVISION OF AMERICAN CAST IRON PIPE COMPANY
ANTICORROSION TECHNOLOGIES
BASELL POLYOLEFINS
BASF URETHANE SPECIALTIES
BERG STEEL PIPE CORP.
BERRY PLASTICS CORROSION PROTECTION GROUP (Covalence® Heat Shrinkable Products, Powercrete®, Polyken®, & AnodeFlexTM)
CANUSA-CPS
CATERPILLAR INC.
CELTIC MARINE CORPORATION
CRC-EVANS PIPELINE INTERNATIONAL, INC.
CREST INDUSTRIAL CHEMICALS, INC.
CRTS, INC.
CSI TUBULAR PRODUCTS, INC.
DENSO NORTH AMERICA INC.
DUN TRANSPORTATION & STRINGING, INC.
DUPONT PIPELINE SOLUTIONS
DURA-BOND PIPE LLC
ENCASE CORPORATION
ERVIN INDUSTRIES, INC.
EVRAZ INC. NA
FAREMOUTH & COMPANY
H.M.S. CORPORATION
HEMPEL COATINGS (USA), INC.
HOFFMAN BLAST II BY CIRCLE R INDUSTRIES, INC.
ITW GEMA
JOHN DEERE WORLD WIDE CONSTRUCTION & FORESTRY DIVISION
JOTUN POWDER COATINGS A/S
JSW STEEL (USA) INC.
KELLY PIPE CO., LLC
LONE STAR SPECIALTY PRODUCTS, LLC
LS INDUSTRIES
M/G TRANSPORT SERVICES, L.L.C.
MCJUNKIN RED MAN CORPORATION
T.G. MERCER CONSULTING SERVICES, INC.
METAL PARTS & EQUIPMENT CO.
MINELCO, INC.
MONTGOMERY TRUCKING, CO.
NORDSON CORPORATION
OFFSHORE JOINT SERVICES, INC.
OSBORN INTERNATIONAL
PE BEN USA, INC.
PEARSON INDUSTRIES INC.
PERMIAN LONE STAR COATING, L.L.C.
PETTIBONE
PIPE EXCHANGE, INC.
PIPELINE INDUCTION HEAT (PIH) US, INC.
PIPELINE INSPECTION CO., LTD.
POLYGUARD PRODUCTS, INC.
PSL NORTH AMERICA
ROHM AND HAAS CHEMICALS, LLC, DBA ROHM AND HAAS POWDER COATINGS
ROSLER METAL FINISHING
SPECIALTY POLYMER COATINGS, INC.
SPT ENERGY GROUP, LLC
STARR NETWORKS SOLUTIONS, L.L.C.
STUPP CORPORATION
TENARIS
TESI GROUP
TEX-TUBE COMPANY
TEXAS PIPE & SUPPLY CO., INC.
TMK IPSCO
TUBULAR SYNERGY GROUP, LP
U.S. STEEL TUBULAR PRODUCTS, INC.
UNIVERSAL MINERALS INTERNATIONAL, INC.
VACUWORX INTERNATIONAL
THE VALSPAR CORPORATION
W ABRASIVES
WEILER CORPORATION
WHEELABRATOR GROUP
WILSON