| N.W.G. | | N.W.L. | | Nac | | Nachi | | Nachi-Fujikoshi | | Naef | | Naf | | Nagase Iron Works | | Naigai | | Nalco | | Nanao | | Nassau Instrument | | National | | National Controls | | National Electric | | National Electronics | | National Engineering | | National Industries | | National Instrument | | National Pl | | National Power Tech | | National Rejector | | National Sonics | | Nc Servo | | Ncg Inc. | | Nci | | Ncr | | Ndc Systems | | Ndk | | Ndt Instruments | | Nea-Lindberg | | Nec | | Nedap | | Neil & Spencer | | Nelson | | Nematron | | Nemic-Lambda | | Neotech | | Neotronics | | Neptune | | Nes | | Netstal | | Network Supply | | Neundorfer | | Neurodyne-Dempsey | | Neutronics | | New Automation | | New Brunswick | | New Hermes | | New Jersey Machine | | New Texas Welding | | Newbury | | Newmar | | Newmark | | Newport | | Niagara | | Nichols Zenith | | Nicolet | | Niehoff | | Nihon Dohki | | Nihon Protector | | Niigata Rubycon | | Nikki Denso | | Nikon | | Nilpeter | | Nimak | | Niobrara R & D Corp. | | Nippo | | Nippon Electric | | Nipson | | Nira | | Nireco | | Niro Inc. | | Nisco | | Nishishiba | | Nissan | | Nissei | | Nisshinbo | | Nitchie Associates | | Nitsuko | | Nittetu | | Nitto | | Nje Corporation |
| | Nkm | | Nobel Elektronik | | Noell | | Nokia | | Non-Linear Systems | | Nor-Lake | | Norand Corporation | | Norcan | | Norcross | | Nordac | | Nordco | | Norden | | Nordic | | Nordson | | Norgren | | Norman Bragar | | Norman Dryer Co. | | Nortech | | North American Mfg. | | North Atlantic | | North Electric | | Northeast Technical | | Northern Computers | | Northern Micro | | Northern Precision | | Northern Telecom | | Northstar | | Norwin | | Norwood | | Norzink | | Notifier Co. | | Nova | | Nova Electric | | Novadyne | | Novatec | | Novatronics | | Novax Industries | | Novotechnik | | Novotron | | Nozaki | | Nr & D | | Nrc Industries | | Nrm Corp. | | Nsc | | Nsd | | Nsi | | Nsk | | Nst | | Ntron | | Nuarc | | Nuclear Research | | Nucon | | Num | | Numatics | | Nuova Fima | | Nuova Pignone | | Nuovo Pignone | | Nusonics | | Nutek | | Nwl Transformers | | Nyk | | O & K | | O-Tronics | | O.E.M.-Elektronik | | O.M.V. | | O.R.S. | | O.S. Walker | | Oberli & Lucca | | Octagon Systems | | Oden | | Odessa Engineering | | Odti | | Oem Controls | | Oerlikon | | Oetiker | | Offset Technology | | Ogden | | Ohaus | | Ohio Brass | | Ohio Motor | | Ohio Semitronics | | Ohmart | | Ohmite |
| | Oil Gear | | Oilgear | | Oit | | Ok Industries | | Okamoto | | Oki | | Okidata | | Oku | | Okuma | | Okuma & Howa | | Okura | | Olec | | Olimatron | | Olite | | Oliver Machinery | | Oltronix | | Olympic Controls | | Omag | | Omega | | Omera | | Omi Crane Systems | | Omicron | | Omni | | Omni Vision | | Omnibyte | | Omnicut | | Omnifax | | Omniprint | | Omnitec | | Omnitester Corp | | Omr | | Omron | | Omron Tateisi | | Omtron | | Onan | | Ondyne Inc. | | One-Ac Corporation | | Online Energy | | Ono Sokki | | Onshore Electronics | | Opacmare | | Opal | | Opcon | | Open Date Systems | | Optek | | Opti-Copy | | Optical Data Systems | | Optimation | | Optimised Control | | Opto 22 | | Opto Electronics | | Orbis | | Orbit Controls | | Orbitran | | Orbotech | | Ore | | Oregon Micro Systems | | Organpak | | Orgapack | | Oriental Motor | | Orion | | Orion Data | | Ormat | | Ormec | | Oroc | | Ortech | | Orycon | | Osacom | | Osai | | Oscar | | Osda | | Osicom | | Otari | | Otc | | Otek | | Outokumpu Oy | | Oval | | Owens-Corning | | Owens-Illinois | | Oxford Technologies | | Oxy-Dry | | Oxycom |
|