?- ACDelco Corporation (General Motors Company)
- ALCO Filters Ltd
- Robert Bosch GmbH
- Cummins Inc.
- DENSO Corporation
- Donaldson Company Inc.
- MAHLE GmbH
- Mann + Hummel GmbH
- Sogefi SpA
- Parker Hannifin Corp.
- Ahlstrom-Munksj?
- Toyota Boshoku Corporation
- Freudenberg & Co. KG