- Gardner Denver Inc.
- Atlas Copco Group
- Sihi Group B.V (Flowserve)
- Busch Pumps and Systems
- Pfeiffer Vacuum Gmbh
- Ulvac Technologies
- Graham Corporation
- Tuthill Corporation
- Becker Pumps Corporation
- Gast Manufacturing Inc. (Idex Corporation)
- Ebara Corporation
- Dekker Vacuum Technologies Inc.
- Tsurumi Manufacturing Co. Ltd.