1.RTX Corporation
2. General Electric Company
3. Textron Aviation Inc.
4. Airmaster Propellers
5. MT-Propeller Entwicklung GmbH
6. Hartzell Propeller Inc.
7. GSC Systems Ltd.
8. Jabiru Aircraft Pty Ltd.
9. Aerosila Research and Production Enterprise OJSC
10. Whirl Wind Propellers Corporation