- Abbott Labs
- Allegiance Healthcare
- Allied Signal Aerospace Equipment Systems
- Argonne National Labs
- Ashland Chemical
- AT&T
- Baxter Healthcare
- Bed, Bath & Beyond
- Boltswitch, Inc.
- Case Corporation
- Charles River
- Charter Steel
- Chatham Elementary School
- Checkpoint
- Chicago Botanical Gardens
- Code 3
- Coleman Chemical
- Columbia Hospital
- Continental Airlines
- Cook Medical
- Daybreak Foods
- Diversifoods, Inc.
- Ferrara Pan Candy Company
- Flex-Tex
- Ford Motor Company
- Friskies Petcare Products
- Generac Corporation
- Genzyme
- Gillette
- Gluek Brewing Co.
- Gonnella Baking Co.
- Graves School
- Harlan Sprague Dawley
- Hy-Vac Lab
- Hysell
- Illinois Department of Corrections
- Illinois Fish Farmers Co-op
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- J.D. Searle
- Johnson Controls
- Jones Dairy Farm
- Keebler Company
- Kellogg
- Kraft Foods
- M&M Mars
- Marathon Oil
- Medichem
- Minnesota Department of Corrections
- Monsanto
- Montessari School
- Morningstar Foods, Inc.
- Naval Hospital Corps School
- Nestle USA
- Nissan Forklift Corporation
- The Quaker Oats Company
- Rayovac Corporation
- Ringger Foods
- Rock-Tenn Company
- Scottsman Ice
- St. Ignatius School
- State of Illinois Capital Development Board
- Superior Coffee
- Trammell Crow Corporation
- Tufts University
- Turris Coal
- University of Georgia
- US Immigration & Naturalization Service
- US Postal Service
- US Veterans Administration
- USDA Nat'l Animal Disease Control Center
- Valspar Corporation
- Warren High School
- Waukegan Corporate Aviation
- Wisconsin Department of Corrections
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