Semiconductors
- Harris Semiconductor
- Fairchild Semiconductor
- Intersil Corporation
Electronics
- Burle Industries, Inc.
- Hewlett-Packard Co.
- Osram Sylvania
- Thomson Consumer Electronics
- General Electric Company
- Kodak Processing Labs
- Bulova Technologies, LLC
Basic Materials
- Cabot Performance Materials
- Chesapeake Finished Metals, Inc.
- NGK Metals Corporation
- Titanium Wire Corporation
- Worthington Steel
- Baker Refractories
- SKF USA, Inc.
- Edgecomb Metals
- Precoat Metals
- Pennsy Supply
- GROWMARK FS, LLC
- Graham Architectural
Food
- McCormick & Co., Inc.
- Spring Glen Fresh Foods
- College Hill Poultry
- Chef Francisco of PA, Inc.
- Heinz U.S.A.
- Dreyer’s Grand Ice Cream
- Hershey Foods
- Keystone Potato Products
- L&S Sweeteners
- Universal Foods Corporation
- Hervitz Meat Packing Plant
Chemical
- Rutgers Organics Corporation
- Sybron Chemicals, Inc.
- Millennium Inorganic Chemical
- Occidental Chemical Corporation
Petroleum
- Sunoco, Inc.
- Amoco
- Dryden Oil Company
Water Companies
- Philadelphia Suburban
- Columbia Water
- Marietta Gravity Water
- Consumers Pennsylvania Water
- U.S. Filter
- Roaring Creek Water Company
- Artesian Water Company
- Tidewater Utilities
- Aqua Pennsylvania, Inc.
- United Water Pennsylvania, Inc.
- The York Water Company
- Pennsylvania American Water Company
Transportation
- Harrisburg International Airport
- Norfolk Southern Corporation
- Washington Metropolitan Area Transit Authority
Manufacturing
- Solar Power Industries, Inc.
- ACCO Chain & Lifting Products Division
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Defense
- BMY
- United Defense Limited Partners
- Northrop Grumman Systems Company
- BAE Systems
- National Security Agency
- General Dynamics
- Aspen Systems
Telecommunications
Pharmaceutical
- Rohm & Haas
- Merck & Company, Inc.
- Aventis Pasteur, Inc./Sanofi-Aventis
- Shire Pharmaceuticals
- Helena Chemical Company
- Whitmoyer Labs
Paper
- P.H. Glatfelter Company
- Armstrong World Industries
- Ahlstrom Paper Corporation
Printing
- R.R. Donnelley
- C-P Converters, Inc.
Steel Tanks
- Chicago Bridge & Iron Company, Inc.
- Caldwell Tanks, Inc.
- Advance Tank & Construction
- Fisher Tank
- Pitt-DesMoines, Inc. (PDM)
Consumer Products
- Susquehanna Pfaltzgraff Company
- Record Club of America
- Sweetheart Cup Company, Inc.
- Playskool
- Congoleum Corporation
- Church & Dwight Company, Inc.
Resorts and Casinos
- Penn National Gaming, Inc.
Educational Institutions
- Milton Hershey School
- Logos Academy
Utilities
- Ameresco Delaware Energy, LLC
- Columbia Gas Company
- Exelon Power
Travel & Entertainment
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