Maclean Power Systems
Magnecraft & Struther-Dunn
Magnolia Chemical
Major Custom Cable
Makita USA
Malton Equipment
Maple Chase
Marconi Communications
Marley Electric
Maryland Specialty Wire
Master Lock
McGill
McGraw-Edison
McPhilben Lighting
Mercury Waste Systems
Merlin Gerin
Metallics
Metalux
Metro Tel
MGE UPS Systems
Microtest
Midwest Electric Products
Milan Technology
Milbank
Milwaukee Electric Tool Corp
Minerallac
Minuteman
Mitel
Modicon
Moldcast Lighting
Mohawk
Morris Kurtzon
MOSCOM/Veramark Technologies
Motorola
MP Husky
MRV Communications
MSD Inc.
Multi-Link
MultiTech Systems
MWS