- M-AUDIO
- M-SYSTEMS
- M-TRON
- M/A-COM
- MAC VALVES
- MACALLY
- MACO
- MACROMATIC
- MACROMEDIA
- MACROTEK
- MACROVISION
- MAG-TEK
- MAGELLAN (THALES)
- MAGNECRAFT
- MAGNETEK
- MALLORY
- MALLORY SONALERTS
- MANHATTAN/CDT
- MAPLE SYSTEMS
- MARATHON
- MARCONI
- MARCONI INSTRUMENTS
- MARKTECH
- MARL
- MARPOSS
- MARTEK
- MARTEK POWER
- MARTEL ELECTRONICS
- MARTIN SPROCKET & GEAR
- MARVELL
- MASTER APPLIANCE
- MATRIX ORBITAL
- MATROX
- MATSUSHITA
- MAXELL
- MAXIM
- MAXTOR
- MCAFEE
- MCC
- MCE
- MCGILL
- MCGILL MANUFACTURING
- MCM ELECTRONICS
- MCMASTER CARR
- MD HELICOPTERS
- ME
- MEAN WELL
- MEASUREMENT COMPUTING
- MEASUREMENT SPECIALTIES
- MEASUREX
- MECHATRONICS
- MEDIA SCIENCES
- MEGGER
- MEGGITT
- MEMOREX
- MEN MICRO
- MENDA
- MENTOR
- MERCURY COMPUTER
- MERLIN GERIN
- METALLICS
- METCAL
- METERMAN
- METHODE
- METRO
- METROBILITY OPTICAL SYSTEMS
- METROLOGIC
- METROTECH
- METTLER TOLEDO
- MG CHEMICALS
- MGE
- MICREL
- MICRO COMMERCIAL COMPONENTS (MCC)
- MICRO CONNECTORS
- MICRO ELECTRONICS
- MICRO INNOVATIONS
- MICRO SOLUTIONS ENTERPRISES
- MICRO TECHNIC
- MICRO/SYS
- MICROCHIP
- MICRODYNE
- MICRON
- MICRON TRANSFORMER
- MICRONAS
- MICRONETICS WIRELESS
- MICROSEMI
- MICROSOFT
- MICROSTAR/MSI
- MICROSWITCH
- MICROTEK
- MIILLE
- MILAN
- MILGO
- MILL-MAX
- MILWAUKEE
- MINI-CIRCUITS
- MINICIRCUITS
- MINICOM
- MINIREEL AVX
- MINMAX TECHNOLOGY
- MINOLTA
- MINUTEMAN
- MISC
- MITAC
- MITEL
- MITSUBISHI
- MITSUMI
- MITUTOYO
- MK (ELECTRIC)
- MMF
- MOBILE EDGE
- MOBILE MARK
- MODICON
- MODUTEC
- MOELLER ELECTRIC
- MOHAWK
- MOLEX
- MONSTER CABLE
- MOOG
- MOORE INDUSTRIES
- MOORE PRODUCTS
- MOSEL
- MOSIER NORGREN
- MOSPEC
- MOSTEK
- MOTION COMPUTING
- MOTOROLA
- MOXA
- MRV
- MSA
- MSI
- MTM POWER
- MTS
- MUELLER ELECTRIC
- MULBERRY
- MULTI-TECH SYSTEMS
- MULTICOMP
- MULTIPLIER
- MULTITECH
- MURATA
- MYLEX
