M.J. Harden
Maats B.V.
Macmoter SpA
MAN Turbomaschinen AG GHH BORSIG
Mark Tool Co.
Marlow Ropes Ltd.
Material Resources Recovery, Inc. (MRR)
Materie Plastiche Brescian SRL / MPB
Maurer Engineering Inc. (MEI)
McElroy Manufacturing Inc.
Mears Group, Inc. / HDD Inc.
Mepr B.V.
MESA Products, Inc.
MESURA SA
Metretek, Inc.
Metso Automation (formerly Neles Automation)
Michels Corporation
Microwave Data Systems (MDS)
Minerals and Metals Sector (MMS)
Mobil Oil Corporation
Mobile Pipe Wrappers & Coaters Inc.
Mooney Controls, Inc.
Moorlink AB
MSA -- Mine Safety Appliances Company
MTL Inc.
MTL Instruments Group plc
Mueller Environmental Designs
Mustang Engineering, Inc.
MyPlant.com