?- Atlas Copco AB
- Ingersoll Rand Inc.
- Baker Hughes Company
- Sundyne
- Elliott Group
- Howden Group
- Mitsubishi Heavy Industries Ltd
- HMS Group
- Borsig GmbH
- Kobe Steel Ltd
- Boldrocchi
- Shenyang Blower Works Group Corporation
- Hitachi Ltd
- MAN Energy Solutions
- Johnson Controls Inc.
- Siemens Energy AG
- Kirloskar Pneumatic Company Limited