| 1 | Mueller Environmental Designs Inc. | | USA |
| 2 | FilterFab Manufacturing Corp. | | USA |
| 3 | Pall Corp. | | USA |
| 4 | Florence Filter Corporation | | USA |
| 5 | APC Technologies Inc. | | USA |
| 6 | Monroe Environmental Corp. | | USA |
| 7 | Swift Filters Inc. | | USA |
| 8 | Dynamic Filtration Ltd. | | USA |
| 9 | Mikropor America Inc. | | USA |
| 10 | Koch Filter Corporation | | USA |
| 11 | Great Lakes Filters | | USA |
| 12 | Clark Air Systems | | USA |
| 13 | Johnson Matthey Stationary Emissions Control LLC | | USA |
| 14 | Welker Inc. | | USA |
| 15 | Hy-Pro Filtration | | USA |
| 16 | N202 | | USA |
| 17 | Troy Filters Ltd. | | USA |
| 18 | Aeolus Corp. | | USA |
| 19 | The Hilliard Corporation | | USA |
| 20 | Clean Liquid Systems | | USA |
| 21 | Gaumer Process | | USA |
| 22 | Filtration Technology Inc. | | USA |
| 23 | Industrial Filter Manufacturers Inc. | | USA |
| 24 | Filpro Corp. | | USA |
| 25 | Turbine Services Ltd. | | USA |
| 26 | Graver Technologies LLC | | USA |
| 27 | SmartFlow Technologies | | USA |
| 28 | Solberg International Ltd. | | USA |
| 29 | ACT Dust Collectors | | USA |
| 30 | Custom Filtration Solutions LLC | | USA |
| 31 | Precision Filtration Products | | USA |
| 32 | ISOPur Fluid Technologies Inc. | | USA |
| 33 | Endustra Filters | | USA |
| 34 | Fluid Conditioning Products Inc. | | USA |
| 35 | Screentek Mfg. Inc. | | USA |
| 36 | Fil-Trek Corp. | | USA |
| 37 | US Petrolon Industrial Inc. | | USA |
| 38 | Quality Filters Inc. | | USA |
| 39 | Filtechsys Inc. | | USA |
| 40 | Fleetlife Inc. | | USA |
| 41 | Alpha-Pure Corporation | | USA |
| 42 | East Coast Filter Inc. | | USA |
| 43 | IMAC Systems Inc. | | USA |
