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| AC DELCO | CATERPILLAR | FACET | HOFF ENG. | MARION | ROWTRON |
| ACCRAFILTER | CESSNA | FACET WEBB | HOFFMAN | MARION-GFK | ROYAL FILTER |
| AIR MAN | CFD | FAIRLEY-ARLON | HOLMAN | MARUKA | RYCO |
| AIR MAZE | CFM | FARR | HONAN-CRANE | MARVEL ENG | SARGENT-WELCH |
| AIR REFINER | CHAMPION | FAU DI | HONEYCOMB | MATTEI | SAYLOR-BEALL |
| AIR-RITE | CHAR-LYNN | FIAMM | HYDAC | MCMASTERS FILTER | SCHRAMM |
| AIRGUARD | CIM-TEK | FILFAX | HYCON | MFP | SCHROEDER |
| AIRKON | CIMCO | FILPRO CORP | HYDRA SCREW | MGD PNEUMATICS | SEPERATION TECH |
| AIRSAN | CINCINNATI MILI. | FILTER CONTROL | HYDRA MAC | MICRO-KLEAN | SERFILCO |
| AIRTEK | CLARK | FILTER DYNAMICS | HYDRECO | MICRO-TOP | SEITHCO |
| AKIN ENGINEERING | CLEARSTREAM | FILTER PRODUCTS | HYDROVANE | MICRO-WYND | SMC |
| ALAN COBHAM | COLT | FILTER-SOFT | HYGECO | MICRONIC | SMI |
| ALASKAN DIESEL | COMMERCIAL | FILTERDYNE | HYPRO | MITSUBISHI | SODICK |
| ALLIED WITAN | COMO | FILTERITE | HYSTER | MOOG | SOLAR |
| ALLISON | COMPAIR | FILTERSPUN | HYTREX | MULTI-QUIP | SOLBERG |
| ALLMAND | COMPAIR CANADA | FILTRI | IAPCO | MURPHY | STAUFF |
| AMBAC | COMPLETE FILTER | FINITE | IFM | MYCOM | STAY NEW |
| AMERICAN AIR | CONAIR | FINN | IMAJE | NAFCO | STODDARD |
| AMERICAN METER | CONSLER | FISPA | INGERSOLL RAND | NAPA | STOKES |
| AMETEK | COOPER BESSEMER | FLEETGUARD | INSLEY | NATIONAL FILTERS | SULLAIR |
| AMF CUNO | COROVAC | FLEX-KLEEN | INTERNORMAN | NELSON | SULLIVAN |
| AP | CPT | FLEXIBLE | INTERSTATE | NORDSON | SUNSTRAID |
| AQUA SORB | CROSLAND | FLO-LINE | JAEGER | NORMAN EQUIPMENT | TAISEI KOGYO CO |
| AQUA ZORB | CROSLEY | FLOW EZY | JOHN DEERE | NUGENT | TDC |
| AQUACON | CROSS MFG | FLUID POWER | JOHNSON CONTROLS | ORION | TECHNOLAB |
| ARGO FILTER | CUNO | FLUITEK CORP. | JOHNSON FILTER | OSMONICS | TEE-EZY FILTERS |
| ARMY-NAVY | CURTIS-WRIGHT | FLUITRON | JOY | PALATEK | TEXTRON |
| ARROW MFG CO. | CUSHMAN | FRAM | KAESER | PALL HYDRAULICS | TORIT |
| ATLAS COPCO | DABCO, INC | FRICK | KAYDON | PALL-TRINITY | TORITE |
| AUSIN-WESTERN | DAF | FUJI | KEENE CORP | PAR-FIT | UCC HYDRAULICS |
| BALDWIN | DAHL | FULFLO | KELLOGG | PARKER | ULTRA FILTER |
| BALSTON | DAVEY | GARDNER-DENVER | KELTEC, INC | PECO | UNITED |
| BANNER ENG | DEERE | GARLA | KINNEY VACCUUM | PERMIA | UNITED ENGINE LIFE |
| BAUER COMPRESSOR | DELTA PURE | GEMCO | KNECHT | PMEUMATECH | UNIVERSAL |
| BECKER PUMP | DELTECH | GENERAL | KOBELCO | PNEUMATIC PRODUCT | VAN AIR |
| BENDIX | DESIGN ENG | GFK, INC | KRALINATOR | PNEUMOTIVE | VELCON |
| BENNET | DUETZ | GLOBAL | LARNAN | POROLITE | VICKERS |
| BETAFINE | DEVILBISS | GOHNER | LENROC | POROMESH | VOKES |
| BETAPURE | DOLLINGER | GRAY MARINE | LENZ | POROUS MEDIA | WORTOX |
| BOLL & KIRCH | DOMINICK HUNTER | GRESEN | LEROI | POWERS | WARNER LEWIS |
| BOWSER-BRIGGS | DONALDSON | GRIMMER SCHMIDT | LEYBOLD | PPC | WAUKESHA |
| BRIGGS & STRATTON | DUNHAM BUSCH | GUARDIAN | LHA | PTI | WEBSTER |
| BRUNSWICK | DURA LIFE | GULFGATE | LILLY AIR | PURAFIL | WESTERN FILTER |
| BUCKEYE | E.P.E. | HANKISON | LUBE CO | PURE AIR | WESTING HOUSE |
| BULLARD | EDMAS | HARVARD | LUBER-FINER | PUROLATOR | WHEELABRATOR |
| BUSCH, INC | ELDORADO TOOL | HASTINGS | M-D BLOWERS | QUANTEK | WILKERSON CORP |
| C.A.V. | ELOX/FANUC | HEAVY DUTY AIR | M.A.N. | QUINCY | WINSLOW |
| CAN FLO CORP | ENDUSTRA | HEIL | M.P. FILTRI | REDMEX | WIX |
| CANADIAN AIR | EPE/EPPENSTEINER | HENDERSON | M.P.PRODUCTS | RIFILCO | YORK |
| CARBORUNDUM | EXCELL | HILLARD/HILCO | MAHLE | ROSAEN | ZINGA IND |
| CASE | EXJET, INC | HITACHI | MANN & HUMMEL | ROSEDALE | ZURN |
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