21st Century
ACSI
AT&T
Austin Commercial, Inc.
Ameritech
Avis Rental Car
Batavia, Illinois
Brooks Fiber Communications
Buffalo, New York
Burlington Northern Railroad
Centex Bateson Construction
Central Illinois Light Company
Central Telephone Company of Illinois
Central Telephone Company of Missouri
Chicago Cable Communications
Chicago Transit Authority
Chicago Union Station Co.
C.N.W. Railroad
Choice Corn
City of Carpentersville, Illinois
City of Carrollton, Texas
City of Chicago, Illinois
City of Cincinatti, Ohio
City of Cresthill, Illinois
City of Dallas, Texas
City of Downers Grove, Illinois
City of Duncanville, Texas
City of Farmers Branch, Texas
City of Highland Park, Texas
City of Irving, Texas
City of McKinney, Texas
City of Naperville, Illinois
City of Plano, Texas
City of St. Louis, Missouri
City of St. Charles, Illinois
City of Streamwood, Illinois
City of Wheaton, Illinois
Commonwealth Edison Company
Consumers Water Supply
Continental Telephone Company of Missouri
Continental Telephone Company of Texas
Continental Telephone System of Illinois
Cook County Highway Dept. of Illinois
C.T.A.
DuPage Water Commission
E.D.S. Land Development
Elmhurst Dept. of Public Works
Fishback & Moore Electrical Contracting, Inc.
Forest Preserve Dist. of Cook County
Frankfurt Properties
Gelinas and Associates
General Growth Properties
General Telephone Co., Irving, Texas
General Telephone Company
General Telephone Company of Illinois
HCB Contractors
Hinsdale Sanitary District
Homart Development
Illinois Capital Development Board
Illinois Central Gulf Railroad
Illinois Department of Transportation
Illinois Maintenance
Illinois Power Company
I.C.G.

Intermedia Communications, Inc.
Indiana Bell
J.C. Penney's Corporation
Kane County Highway Dept. of Illinois
Kankakee Water Company
L.E. Myers Company
Las Colinas Corporation / Faison Stone
M&M Properties
MCI
Manhattan Construction Company
Media One
Mellon Stuart Corporation
Metra I.C.G. Railroad
Metro Access Networks
Metropolitan Fiber Systems
Metropolitan Rail
Metropolitan Sanitary District of Great Chicago
Michigan Bell Telephone Company
Missouri Power & Light Company
Montgomery Watson Construction
National Car Rental
Nextlink
Norfolk Southern R.R.
Northern Illinois Gas
North Texas Municipal Water District
Northwestern Bell Telephone Company
Omaha Public Power District
Peoples Gas Corporation
Power Contracting Corporation
Public Service of Illinois
Qwest Communications
Rock Island & Pacific R.R. Co.
South Central Bell
Southwestern Bell Telephone Company
S.P. Construction Services
State of Illinois Dept. of Conservation
Tele Cable of Bloomington-Normal
Tele Communications, Inc.
Teleport Communications Group
Texas Turnpike Authority
Trinity River Authority of Texas
TU Electric
T.U. Services
U.S. Government-Dept. of Navy
U.S. Sprint
Union Electric Company
Union Pacific Railroad
United Telephone Company
Utilities, Inc.
Village of Bloomingdale, Illinois
Village of Elmhurst, Illinois
Village of Frankfort, Illinois
Village of Franklin Park, Illinois
Village of Mt. Prospect, Illinois
Village of West Haven, Illinois
Village of Westchester, Illinois
Village of Westmont, Illinois
Village of Willow Springs, Illinois
Western Electric Western Union
Will County, Illinois
Willowbrook Utility Co.
Wisconsin Electric Power Co.
Wisconsin Telephone Co.
WorldCom