Abell-Howe Co.
Brandenburg Industrial Services Inc.
Capitol Construction Group
Chicago Board of Education
David Architectural Metals
Delgado Erectors Inc.
Dominick's Finer Foods Inc.
Drake-Williams Steel, Inc.
Flour-Daniel
Fred Berglund & Sons Inc.
Havens Steel Company
H. K. Ferguson
Jewel Osco
Kewit Western Co.
Kenny Construction Co.
Kline Iron & Steel Company Inc.
Morse Diesel International
Mota Construction Company, Inc.
Munster Steel Co. Inc.
Midwestern Steel Fabricators Inc.
Midwest Steel Inc.
Owens Steel Company
Paul H. Schwendener Inc.
Pepper Construction Company
Pitt-DesMoines, Inc
Power Contracting
Public Building Commission of Chicago
Riteway Construction Co.
Simpson Construction Co.
T5V Terminal Venture
Turner Construction Co.
UBM Inc.
United Steel Fabricators, Inc.
Walsh Construction Co.
W. E. O' Neil
Zalk Joseph's Fabricators Inc.