Aercology

Air Flow Technology

Air Seal Filter Housings

Baldwin Filters

Cameron-Great Lakes

Camfil FARR

Columbus Industries

Controlled Release Tech.

D-Mark Corp.

Donaldson/Torit

Dwyer Instruments Inc.

Environmental Filter

Filter Media Services

Flanders/PrecisionAire

Freudenburg Nonwovens

Glasfloss Industries

Hypro Filter

Industrial Filter

Keltec

Knight Corporation

Koch Filter Company

Norman Ultraporus

Osmonics Corporation

Fiberbond Corporation

Quality Filter Recyclers

Refilco

Research Products

Royal Filter Mfg.

Rutzler Filter

Solberg Mfg.

Southern Filter Media

Steril-Aire

TDC Filter

United Filter

Zander