- AC/DC
- Acme
- Accopian
- Adtech
- Advanced Power Corporation
- American Power Conversion
- Astec
- AT & T
- Best Power
- Behlman
- Boschert
- California Instruments
- Cherokee
- C + D (Charter Power)
- Computer Products
- Condor
- Convertor Concepts
- Coutant
- Datacube
- Datashield
- Delphax
- Delta
- Deltron
- Diablo
- Digital
- Elco
- Electronic Measurements, Inc.
- Elgar
- Elpac
- Emerson
- Fraco
- Gossen
- Grass Valley
- Harris Corporation
- HC Power, Inc.
- Hewlett Packard
- IBM
- Intronics, Inc.
- ITT
- Jeta
- Lorain
- KEC Electronics
- Kepco
- Kwan Chiu
- Lambda
- L.H. Research
- Microcomputer Power, Inc.
- MicroENERGY, Inc.
- Modern Power Conversion
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- Mitel
- NCR Corporation
- Para Systems
- Pioneer Magnetics
- Power Components
- Power Conversion Products
- Power Design
- Power General
- Power One
- Powermate
- Power Pac
- Power Sources Int'l
- Power Systems, Inc.
- Powertec
- Power Ten, Inc.
- Powerline, Inc.
- Prime Power, Inc.
- Safe
- Seagate
- Semiconductor Circuits
- SGS Semiconductor
- Siemens
- Sierracin Power Systems
- Sola
- Sony
- Sorenson
- Standard Power, Inc.
- Stevens-Arnold Division
- Storage Technology
- Summit Electronics
- Sun Microsystems
- Switching Power
- Switching Systems
- Tamura
- Tectrol
- TDK Corp of America
- Teapo Corp of America
- Technology Dynamics
- Todd Products
- Tokin
- Topaz
- Toshiba
- Transistor Devices
- Tripplite
- Unipower
- Volgen
- Weir Electronics
- Xentek
- Zytec
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