Alcatel, France
Ameron Pipe Company
American Concrete Pipe Association
Angus and Terry, Law firm, California
Asian Development Bank, Phillipines
Atlas Excavating Company, Indiana
Belleli spa, Italy
Bromwell and Carrier, Inc., Florida
Brugg Cables Group, Switzerland
California Precast Concrete Pipe Association
CityNet Telecommunications, Inc., Maryland
City of Portland, Oregon
City of Reno, Nevada
City of San Diego-Water Utilities Department
City of Seattle, Washington
City of Stoughton, Wisconsin
Concrete Pipe Association of Michigan
Cretex Companies, Minnesota
CSR, Australia
Cultec, Connecticut
Dicky Clay Pipe Corp., Kansas
DTI CableCat Gmbh, Germany
Eastern Illinois Precast, Illinois
Erickson Law Firm, Texas
F.F. Cruz, Contractors, Phillipines
Florida Institute of Phosphate Research
Fritschler, Pellino, Schrank, and Rosen, Wisconsin
GCA Corp., Massachusetts
Geocon (1975) Ltd., Canada
Gladding and McBean Pipe Products, California
Goins and Underkofler, Texas
Gruppo Sarplast, Italy
Hardy & Associates (1978) Ltd., Canada
Harza Engineering Company International
Heiskell, Bearman, et al, Tennessee
Hobas Group, Austria
Hydro Conduit Corp., California
Illinois Concrete Pipe Association
Insituform Group, United Kingdom
Insituform of North America, Inc.
Interflow, Australia
J.F. Shea Construction Company
JM Montgomery Consulting Engineers
K.W. Brown & Associates, Texas
Kansas State Department of Health
Ka-te Robotic Systems, Switzerland
Landes Gewerbeanstalt Bayern, Germany
Lewis & McKenna, Law firm, New Jersey
Logan Clay Products, Ohio
Mears Group, Michigan
Mead and Hunt, Wisconsin
Melli, Walker, Pease, and Ruhly, Wisconsin
Minnesota Power and Light Company, Minnesota
Mission Clay Pipe Products, Arizona
Mountain States Concrete Pipe Association
National Clay Pipe Institute, Washington, D.C.
New York State Concrete Pipe Association
Nippon Hume Corporation, Japan
North West Steel Pipe & Casing, Oregon/California
Northern States Power Company, Michigan
Ohio Concrete Pipe Manufacturers Association
Ontario Concrete Pipe Association, Canada
Pacific Clay Pipe Products, California
Pacific International Pipe Engineering, Washington
Pacific Northwest Concrete Pipe Association
Preussag AG, Germany
Price Brothers Company, Ohio and Florida
Quanta Services, Texas
Quebec Concrete Pipe Association
Ribloc Group, Australia
Ropes, Majeski, Pagliaro, et al, Law firm, California
Saline Water Conversion Corporation, Saudi Arabia
San Diego County Water Authority
San Diego Gas & Electric Company
SCS Engineers, Washington, D.C.
Semitropic Buttonwillow Water Storage District, California
Service Corp. International
Sithe Energies, France
Snamprogetti spa, Italy
Snowden & Meyer Associates, Texas
Spencer J. Buchanan & Associates, Texas
Spokane Concrete Pipe Products, Washington
St. Louis Metro Sewer District, Missouri
State of Wisconsin-Division of Facilities Management
Steel Pipe Manufacturers Association, Philippines
Steel Plate Fabricators Association
Streamline, Australia
Superior Clay Pipe Corporation, Ohio
Technical University of Nova Scotia, Canada
Tippetts Abbey McCarthy Stratton, New York
TopCote, Sweden
U.S. Army Engineer Waterways Experiment Station
U.S. Environmental Protection Agency
WE Energies, Inc, Wisconsin
Wheeler Ridge Maricopa Water Storage District, California
Wisconsin Concrete Pipe Association
World Bank
Young, Wooldridge, Farr, Griffin, and Others, California