| 3Com | 3M | |
| Baco | Baird & Tatlock | Baldor |
| Balluff | Balston | Balzer, see Balzers |
| Balzers | Balzers Union | Banner Engineering |
| Barcopac | Barden | Barker & Williamson |
| Barksdale Inc. | Barr & Wray | Baumer |
| Baumer Electric | Beckhoff | Beckman Instruments |
| Belfab | Belling Lee | Belling-Lee |
| Bellingham & Stanley Ltd. | Berger Lahr | Berkleonics |
| Beta Squared | Bi Technologies | Bimba |
| Binder | Bio-Rad | Bird |
| Bird Electronic | Biscor | Bishop Wisecarver |
| Blomme | Blondelle | Blue White |
| BOC | Bodine | Boiswood |
| Bourns | BPS | Branson |
| Brecoflex | Brecooflex | Briskheat |
| British Telecom (see BT) | Brook Control Gear | Brook Crompton |
| Brooks Instruments | Brown Bouveri | Bruce |
| BSL | BT | BTI |
| Burgess | Burkert | Burndy |
| Burr Brown | Burrell Pneumatic | Buss |
| Bussman | Bussmann | |
| C & K | C&K | Cabletron Systems |
| Caburn MDC | Cajon | California |
| Cambridge Technology | Camfil Farr | Camille Bauer |
| Cannon | Canon | Carlo Gavazzi |
| Cathodeon | Cayman Systems | CB+B |
| Cbf | Ceep | Cegelec |
| Cehess | Celerity (Formerly Unit Instruments) | Cemco |
| Centralab | Cerac | CFW |
| Cha | Charntec | Chell Instruments |
| Chem-Tec | Cherry | Chessel |
| Cigol | Cinch Jones TRW | Cisco Systems |
| Cita | Ckd | CKD Corp |
| CLAL | CLC | Cleveland |
| Clippard | Cobrain | Comair Rotron |
| Comark | Comat | Comet |
| Comlinear | Compac Engineering | Compact Air Products |
| Compair Kellog | Compaq | Computacenter |
| Computer Products | Condor | Consolidated Bearings |
| Contact | Contaminatio | Contelec |
| Continental Industries | Continental Rubber | Controlasco |
| Convac | Convum | Cooke Vac |
| Coolidge & Kincaid - C&K (ITT Cannon) | Cooper | Copal |
| Copley Controls | Corcom | Cornell Dublier |
| Corning | Corteco | Coto |
| Coutant Electronique | Cravenmount | Crofton |
| Crydom | Cryo-Twenty | CTI (Helix Technology) |
| CTI - Cryogenics | CTS | Cuno |
| Cuthbertson | Cutler | Cutler Hammer |
| CVC | CVI | |
| L'Unite Hermetique | Lab Facility | Lam |
| Lambda | Lascar | Laser Drive Inc. |
| Lauda | Lee Spring Co | Legrand |
| Legris | Leica | Leitz |
| Lemo | Lenze | Leodyne |
| Lewden | Lexmark | Leybold |
| LH Research | LI Components | Linear |
| Liteon | Littelfuse (Inc.) | Lucifer |
| Lufran | Lufran Inc | Lutze |
| Qms | Qualidyne | Quality Precision |
| Quartzfab | ||
| UCC | Ulrick Matter | Ultratech |
| Ulvac | Unaxis | Unbranded |
| Unimation | Unimax | Uniphase/Cyonics |
| Unit Instruments | United Electric | Unitrode |
| Unitta | US Dynamics | US Gauge |
| Ushio | ||
| Vac | Vacuum General | Vacuum Generators (Vg) |
| Vacuum Technology | Varian | Varta |
| Vat Valve | Vectron | Veeco Instruments |
| Veriflow | Verteq | Vesuvius Zya |
| Vexta | Victory | Vinyl Glass Ltd |
| Virax | Visaton | Vishay |
| VWR | ||
| X-Acto | Xycarb Ceramics | Xycom |
| Yamada | Yellow Spring | Yokahama Kyoritsu Denki |
| Ziatech | Zilog | Zitel Corp. |
| Zurrer |
