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- AMP Incorporated
- AVX Corporation
- Advanced Nuclear Fules Gmbh
- Allen Bradley Company
- Aluminum Company of Canada
- ALCOA
- Anglo-American Clays Corp.
- Ashland Petroleum Company
- The BOC Group
- Canadian General Electric
- The Carborundum Company
- Ceramic Magnets
- Conoco Inc.
- Delcap
- Delco Products
- Dow Chemical Company
- E.I Dupont de Nemours & Co.
- Duracell Inc.
- Eastman Kodak Company
- Eaton Corporation
- Littlefuse
- Exxon Nuclear Company, Inc.
- Fair-Rite Products
- Ferro Corporation
- Osram Sylvania
- General Electric Company
- Gold Star Semiconductor, Ltd.
- Gould Laboratories
- Hitachi Magnetics Corporation
- Honeywell Inc.
- IBM Corporation
- Japan Nuclear Fuel
- Kyocera International, Inc.
- Lockheed Incorporated
- Lucent technologies
- Lucky Advanced Materials Inc.
- McGraw-Edison
- Mitsubishi Rayon
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- Magnetic Peripherals Inc.
- Martin Marietta Energy Systems
- Mobil Corporation
- Moll Energy Limited
- Monsanto Company
- Motorola Inc.
- Murata Erie North America
- NGK Insulators, Ltd.
- Nashua Corporation
- National Beryilla Corp.
- North American
- Norton Company
- Olln Corporation
- PPG Industries, Inc.
- Phillips Petroleum Company
- Pratt & Whitney Aircraft Group
- RCA
- Raytheon Company
- Remex Corporation
- Samsung Electron Devices
- Sprague Electric Company
- Steward
- Sunnen Products Company
- TRW Inc.
- Texas Instruments Incorporated
- Thompson CSF Components
- Titan Corporation
- Trak Microwave
- Treibacher
- Union Carbide Corporation, subsidiary of the Dow Chem.
Co.
- Unlays
- Untrode Corporation
- Varian EIMAC
- Westinghouse Electric Company
- Xerox Corporation
- Zircatec
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