- Air Accessories Co
- Babb Agri-Sales
- Butler Cnty Voter Registration
- Central Illinois Mfg Co
- Essex Manufacturing Co
- Fabrication Specialties
- Filtech Inc
- Murphy's Filtration Element
- National Filters Inc
- Oil Filtration Systems
- Oil Filtration Systems
- Parker-Hannifin Corp
- Parker-Hannifin Racor Div
- Porous Media
- Porous Media
- Porous Media
- Purolator Air Filtration
- RCI Technologies
- Schroeder Industries
- TBDN Tn Co