1. Akkerman Inc.
2. China Railway Construction Heavy Industry Co. Ltd.
3. China Railway Engineering Equipment Group Co. Ltd.
4. DHHI Group of Companies
5. EBERK Corporation
6. Herrenknecht AG
7. JIM TECHNOLOGY CORPORATION
8. Kawasaki Heavy Industries Ltd
9. Komatsu Ltd.
10. MBCC Group
11. Qinhuangdao Tianye Tonglian Heavy Industry Technology Co. Ltd.
12. Robbins by Northern Heavy Industries Group Co. Ltd.
13. ROCK MECH ENTERPRISES
14. TERRATEC Ltd.
15. Xiamen XGMA Machinery Co. Ltd.