Aachen Plastic Equipment Co. - TAIWAN

ABB AG - SWITZERLAND

ABB Air Preheater, Inc. - OH, USA

ACWa Services Limited - UNITED KINGDOM

Advanced Environmental Systems,Inc. - MD, USA

Adwest Technologies, Inc. - NY, USA

Air Poll.Charactzn.&Cntrl/APCC - CT, USA

Air Preheater Company-NY,USA - NY, USA

Air Process Control Sys., Inc. - CA, USA

Air Toxics Ltd. - CA, USA

Air-Cure Environmental, Inc. - MN, USA

Airex Corporation - CA, USA

Airex Corporation - CA, USA

Airguard Industries, Inc./ Clarcor - KY, USA

AirScience Technologies - CANADA

Albany International Corporation - NY, USA

Allied-Signal Envr. Catalyst - OK, USA

AlliedSignal, Inc. - AZ, USA

Alltop Industrial Co. Ltd. - TAIWAN

Alstom Power K.K.-Japan - JAPAN

Alstom Power, Inc. - CT, USA

Alstom Power, Inc/ Envr.Control Sys - TN, USA

Altech Environment U.S.A. - IL, USA

Alzeta Corporation - CA, USA

Ambient Engineering, Inc. - NJ, USA

American Envr.Int'l.,Inc./AEI - IL, USA

Ametek Rotron Industrial Products - NY, USA

Andersen 2000, Inc. - GA, USA

Anguil Environmental Systems - WI, USA

Applied Web Systems, Inc. - IL, USA

APV Baker, Inc. - MI, USA

ARCADIS Geraghty & Miller,Inc. - CO, USA

Arthur D. Little Company - CA, USA

ATMI Ecosys Corporation - CA, USA

Atochem North America, Inc. - PA, USA