A. W. Mercer, Inc.
Aberdeen Proving Ground
Alcoa
Alpo Pet Foods
Alumax Mill Products, Inc.
Appleton Papers, Inc.
Architect of the Capitol
Armstrong World Industries, Inc
ASM Industries, Inc.
Atlantic Electric
Avery Chemical
Berk-Tek, Inc.
Bethlehem Steel
B. F. Goodrich Company
BMY Combat Systems
Calvary Hospital
Canadian Airlines International Ltd.
Carpenter Technology Corp.
Caterpillar Inc.
C & D Power Systems
Champlain Water District
Chester County Aviation Authority
Ciba Specialty Chemicals
Columbian Chemicals Company
Consolidated Edison
Consumers Power Company
Datcon Instrument Company
Delaware Technical & Community College
Delta Air Lines, Inc.
Donnelley Printing Company
Drakenfeld Colors
Dynegy
Elixir Industries
Enterprise Telephone Company
Firemen’s Fund Insurance Company
Ford New Holland
General Chemical
Georgia-Pacific Corp.
Glasgow, Inc.
Glidden
GNB, Inc.
Harley-Davidson
Harrisburg Hospital
Hazard Control Program, Indiana University
Herr Industrial
Horst Development
IBM
ICI Paint
Intelligencer Printing Company
ISC Defense Systems
Johnson & Johnson Merck
KD Tool
Kellogg Company
Kunzler & Company, Inc.
Lancaster Airport Authority
Lancaster Chamber
Lancaster Laboratories
Lancaster Newspapers, Inc.
Lancaster Press, Inc.
Lukens Steel Company
Luzerne County Community College
Martin Limestone, Inc.
Martin Marietta
Merck & Company, Inc.
MK-Ferguson
Mobil Pipe Line Company
NAB Construction
National Fire Protection Association
National Safety Council
Nekoosa Papers, Inc.
North Industrial Chemicals
North Louisiana Safety Association
Offset Paperback Manufacturers, Inc.
OSHA Training Institute
Paccar Parts
Penn State University
Pennsylvania Power & Light
Pepsi-Cola General Bottlers, Inc.
Pfaltzgraff Company
PMA Group
Premark International
Printpack, Inc.
Pyfer & Associates
Riverwood International
Sun Pipe Line Company
TAH Construction
TRW Automotive
Turkey Hill Dairy
Union Camp Corp.
University of Delaware
University of North Carolina
U. S. Army
U. S. Capitol Power Plant
U. S. Postal Service
U. S. Steel
Vistakon
W. L. Gore
Warner-Lambert Company
Washington Steel
Wawa, Inc.
Wellspan
Western Pennsylvania Chapter of ASSE
Westinghouse Electric Corp.
Wickersham Construction & Engineering, Inc.
Woodstream Corp.
Yellow Freight
Yorktowne Paper