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3Com 3M A&H Testing A&T Recovery ABB Impell Corp. ABN-AMRLO Bank ADC Telecommunications AEC AFG Industries AG Communication Systems AG Industrial Millwright Service AG Leader Technology AK Steel ALCOA AMF Corp. ANR Pipeline ANSER Analytic Services Inc. AON Consulting ARI Technologies ASARCO Inc. ASI Controls ASIC Designs Inc. AT&T (Bell Systems through 1983) ATF ATI Research Abam Engineers Abbott Laboratories Abel Agriproducts Accenture Acme Steel Co. Accurate Threaded Fasteners Accuvoice Inc. Active Glass Co. Adams Electrical Co-operative Addamax Corp. Admiral Corp. Advance Mechanical Systems Advanced Analytics Corp. Advanced Fibre Communications Advanced Information Services Inc. Advanced Mechanization Inc. Advanced Micro Devices Advanced Scheduling & Control Aerojet General Aerospace Corp. Agere Systems Agilent Technologies Air Float Air Liquide Air Products & Chemicals Inc. Air Research Mfg. Co. K. H. Alborn, Inc. Alcatel Alcoa Allen-Bradley Co. Allen & O'Hara Inc. Alliance Systems  & Programming Inc. Allied Signal Allis-Chalmers Corp. Allison Engine Co. Allstate Insurance Co. Alpart Trading Alpha Industries, Inc. ALTERA Corp. Altschuler, Melvoin & Glasser Ambitech Design Services Inc. Amdahl Corp. Amdocs American Air Filter Co., Inc. American Bridge Co. American Brass Co. American Buildings Co. American Can Co. American Elec. Power Service Corp. American Express American Flyash Co. American Management Systems Inc. American Micro Systems, Inc. American Motors Corp. American National Can American Satellite Co. American Standard Inc. American Steel Foundries American Stores Properties Ameritech Services Inc. Amocams Inc. Amoco Corp. Ampex Corp. Ampro Inc. Amsted Industries Amsted/Burgess-Norton Div. Anaconda-Ericsson Inc. Analog Devices Inc. Analytical Graphics Inc. Andersen Consulting Andersen Worldwide Anderson Die Castings Inc. Robert Anderson & Associates Andrew Corp. Andrews Env. Engineering Inc. Anheuser-Busch & Co. Animal Env. Specialists Anixter Cable TV Anixter-Mark Ann. Statement Automated Products Apogee Medical Products Inc. Apple Computer Inc. Application Engineering Corp. Applications Mapping Inc. Applied Engineering Co. Applied Materials Applied Physics Laboratory Applied Signal Technology Applied Systems Inc. Applied Telecom Applied Web Systems Inc. Archelon Partners Inc. Archer-Daniels-Midland Co. Arco Construction Co. Arco Metals Co. Ardaman & Assoc. Arens Controls Inc. Argonne National Laboratory Argus Systems Group Arial Systems Corp. Arizona Dept. of Transportation Arizona Public Service Co. Armco Inc. Armstrong World Industries Inc. Aro Industries Inc. Arrow Gear Co. Arthur Andersen Atchison, Topeka & Santa Fe RR Atex, Inc. Guy F. Atkinson Co.  Atlantic Richfield Co. Atlas Wireline Services Atwood Automotive City of Aurora, IL Austin Co. Authoria Autokinetics, Inc. Automated Analysis Corp. Automated Solutions Automation Solutions Automation Equipment Center Automotion Aventek, Inc. Avici Systems, Inc. Axis, Inc. Aztech Systems B&B Electronic Mfg. B&B Printing Co. BALR Corp. BBC Brown Boveri, Inc. BDM International Inc. BDS, Inc. BOCA International BP Amoco BRK Electronics BSG Consulting BSG IT/Alliance BT Prime Mover BTI Computer Systems B-Line Systems Inc. Babcock & Wilcox Co. Bailey Controls Bainbridge/Gee/Milansk

Baker Engineering Inc. Baldwin Assoc. Ball Aerospace Corp. Ball Corp. Baltimore Aircoil Co. Banyan Systems Inc. Barba & Barba Construction Co. Barber-Colman Co. Barran Blakeslee Barry, Theodore & Assoc. Bartlett-Collins Co. Barton-Aschman Assoc. Batesville Casket Co. Battelle Memorial Institute Baxter Healthcare Corp. Baxter and Woodman Beam, Longest & Neff Bechtel Corp. Beech Aircraft Corp. Beiling Consultants Belcan Tech Services Belden Belford Electronics Beling Engineering Consultants Bell Communications Research Bell Helicopter Textron Bell Northern Research Ltd. Beloit Corp. Beltec International Beltone Electronics Corp. Bendix Corp. Benesch, Alfred & Co. Benteler Industries Inc. Berns Clancy & Assoc. Berry Bearings Beta Technology Sales Bethlehem Steel Corp. Bettis Atomic Power Laboratory Bio-imaging Research Inc. Bison Gear & Engineering Black & Veatch Engineers Blackhawk Foundation Blinderman Construction Co. Bloomington Computer Service Blunt & Hamm Engineers Bobcat Company Boeing Co. Bohn Heat Transfer Bonutti Orthopedics R. W. Booker & Assoc. Booz Allen & Hamilton Inc. Borg-Warner Corp. Robert Bosch  Bosch Braking Systems Bovis Construction Corp. Bowen Engineering Corp. Bowman, Barrett & Assoc. Braun Consulting Braun Technology Group Bridgestone Firestone Brience Brighton Engineering Co. Broadcast Electronics Inc. BroadVision E. B. Bronson Co. Bronson & Bratton Inc. Brookhaven National Laboratory P. H. Broughton & Sons Brown & Root Inc. Brown & Williamson Browning-Ferris Industries, Inc. Brunswick Corp. Bucyrus-Erie Bull Information Systems Bunge Edible Oil Co. Bunker Ramo-Eltra Corp. Burgess-Norton Mfg. Co. Christopher Burke Eng. Ltd Burlington Consulting Burlington Environmental Inc. Burlington Northern, Inc. Burlington Northern  Santa Fe Railway Burnham Hospital Burns & McDonnell Engineering Burr-Brown Corp. Burroughs Corp. Burtness Engineering Services Burton Industries Business Data Services Business Logic Holding Corp. C-Bridge Internet Solutions CAE CAI/Div. of Recon Optical CBS Technology CCL Custom Manufacturing CDI Corp. CH2M Hill, Inc. CICI Inc. CIMCO CMGI Solutions CNA Insurance Co. CP Environmental CPM Corp. CRSS of Illinois Inc. CRS Sirrine Inc. CSC Consulting CSC Intelicom CTC CTE Engineers CTS Corp. CTS Wireless CUH2A Architecture Engineer Cabot Corp. Cahners Business Info. Calderwood Corp. Calhoun Co. Contracting Corp. CA Transportation Dept. Cameron Iron Works, Inc. Canberra Nuclear Canonie Env. Services CAP Gemini Ernst & Young Capital One Capitol Marble & Granite Co. Caradco Cardiac Pacemakers Inc. Carnation Co. Carolina Power & Light Co. Carrier Corp. Carroll Touch Technology J. I. Case Co. Case Corp. Case New Holland Casler, Houser & Hutchison Casler Surveying & Engineering Co. Castle Engineering Caterpillar Inc. Ceco Construction Co. Ceco Corp. Cellular One ComDisco Cemcon Ltd Centel Corp. Centerline Controls Central IL Controls Central IL Power & Light Co. Central IL Public Service Co. Central Soya Inc. CertainTeed Corp. Cessna Aircraft Co. Champaign Asphalt Co. Champion International Corp. Champion Laboratories Inc. Chance Load Management Systems Charles Industries Ltd. H. L. Chastain & Assoc. Checker Oil Co. Chessie Systems Railroad Co. Chevron Corp. Chicago Aerial Industries Chicago Bridge & Iron Co. City of Chicago, IL Chicago Lock Co. Chicago & Northwestern Trans. Co. Chicago Precast Products Chicago Research & Trading  Chicago Title & Trust Co. Chicago Trading Company Chicago Transit Authority Chilson's Management Controls

Christian-Roge & Assoc. Christopher Burke Engineering, Ltd. Chromatic Research, Inc. Chrysler Corp. Cimnet Inc. Cirrus Logic/Crystal Semiconductor Cisco Systems Citicorp City of Normal City Water Light & Power Co. Ciorga Group Civiltech Engineering Inc. Clarida Engineering Co. Clarity Consulting Clark Dietz Inc. Clark Engineers Inc. Clayton Engineering Clean Air Engineering Clinton Power Station Clorox Cobalt Networks Cochran & Wilken Inc. Codex Corp. Coe-Truman Technologies Coilcraft Inc. Cole Associates Collegiate Cap & Gown Co. Ronald A. Cole & Assoc. Collins & Rice Collins Commercial-Rockwell Colonial Pipeline Co. Colorado School of Mines Colorado Ute Electric Assoc. Colt Industries Inc. Colwell Systems Inc. Comark Combustion Engineering Co. ComEd Commonwealth Alumninum Co. Commonwealth Edison Co. Commquest Tech. Communications Data Group Compaq Computer Corp. Compre Comm. Inc. Compressor Development Corp. Compressor Engr. Co. Computer Adaptive Technology Computer Associates Computer Automation, Inc. Computer Sciences Corp. Computer Support Group Compuware Inc. Connecticut Metallurgical Inc. Connor & Connor Consulting Consulting Engineers Group Consumers Power Co. Contech Construction Products Contel of Illinois Continental Corp. Continental Ozark Control Data Corp. Control Engineering Corp. Control Enterprises Inc. Control Solutions Convex Computer Corp. Cook Co. Highway Dept. Cooking.com Cooper Industries Inc. Cooper Lighting Coors Ceramics Co. Corning Corning Glass Works Corp for National Research Initiatives Corporate Consult/Develop Co. Corporate Technologies Corrosion Services, Inc. Cotter Consulting Courseware Applications Cowhey, Gudmendsen & Leder Craft Products Co. John Crane Industries Crawford, Murphy & Tilly Inc. Cray Research Inc. Creative Labs/E-Mu Systems Credit Saison Crest Inc. Crouse-Hinds William L. Crow Const. Co. Crowe Chizek Crystal Semiconductor Culligan International Cummins Engine Co. Curry & Assoc. Cyclone Videos Cypress Semiconductor Corp. Cyrix Corp. DAI Environmental DARC Development DC Systems DOE/BWXTY-12 DSC Communications Daily & Assoc. Engineers DaimlerChrysler Dallas Semiconductor Dames & Moore Danis Heavy Construction Co. Danville Community College Danville Metal Stamping Co. Data General Corp. M. T. Davisson Consulting Daxcon De Amertek Dean Foods Co. Decatur Electronics Decision Science Applications Deere & Co. Degussa Chemical DeKalb Agresearch Inc. DeLeuw-Cather Co. Dell Computer Co. Deloitte Consulting Deloitte & Touche Consulting Delphi Harrison Thermal Systems Delphi Steering Systems Demaco, Inc. Design Engineering Detroit Central Tool Detroit Diesel Corp. Dewberry & Davis Dexter Magnetic Technologies Diamond Chain Co. Diamond Exteriors Diamond Star Motors Diamond Technology Partners Dickerson Engineering Inc. Digalog Corp. Digital Appliance Controls Digital Equipment Corp. Digital Microwave, Inc. Digital Semiconductor Digital Systems Corp. Digital Technology Corp. Dimension Molding Dirilten Builders Discover Card Novus Discover Financial Services Walt Disney World Distributed Systems Inc. Dolby Labs. Donaldson Co., Inc. R. R. Donnelley & Sons Co. Dover International Dow Chemical Co. Dow Corning Corp. A.J. Dowiatt Inc. Doyen & Assoc. Dravo Corp. Dresser Industries Inc. Dresser-Rand Duke Associates Duke Engineering & Services Duke Power Co. Dunlee/Picker International Dunn Systems DuPage Co.  Duplitronics Dupont E. I. DuPont de Nemours & Co. Durable Inc. Dwyer Instruments Inc.