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                      | Catergory M |  
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| M - SYSTEM | M - TEK | M/A-Com | Mackwell Electronics | Macronix | Maestro Lite |  
| Mag Instruments | MAGNAFLUX | Magnecraft | MAGNETROL | Maine Engineering | Makita |  
| Mallory Capacitors | Mannesmann Rexroth | Manufor | Marbo | Marbourn | Marcaddy |  
| Marigold Industrial | Marl | Marlow | MARTEL | MASONEILAN | MASTER APPLIANCE |  
| Master Technology | MATHESON GAS | Matra MHS | Matsushita | MAUELL | Maun Industries |  
| Maxell | Maxim | Maxon | Mayr Transmissions | McGraw Hill | McMurdo |  
| Meadows Mouldings | MEC CGS | MEC Citec | Megger | MEGGER | Meggitt | 
 
| Mektron | Melcher | Melles Griot | MEM | MERIAM INSTRUMENT | Merlin Gerin |  
| Metalrax | Metalwork | Metrinch | METRIX | Metrix Electronics | METROHM |  
| Metway Electrical Industries | MFW Electronic | MH Connectors | Micrel | Micro Crystal | Micro Linear Corporation |  
| Micro Power | Microcomputers Systems Components | Microgenic | MICROMOTION | Microrobotics | Microsemi |  
| Microtherm | Microversal | MIKRON | MISTRAL | Mita | Mitel |  
| MITSUBISHI | Mitsubishi Electric | MITUTOYO | Mitutoyo (UK) | MK | MKS |  
| Mobil Oil Company | ModTap | Modular Technology | Moeller | MOELLER | Mohawk |  
| Molex | MONARCH | MONITOR | Monitran | Moore & Wright | MOORE INDUSTRIES |  
| Motorola | Motorola Semiconductor | Motovario | Moulded Electronic Components | MPE | MQP |  
| MRM | MSA INSTRUMENTS | MTE | MTL | Multicomp | Multi-Contact |  
| Multicore Solders | Multi-Lab | Murata Electronics | MURPHY | MYRON L |  |  |  |  |  |  |  |  |