American Elements
CERATIZIT S.A.
China Minmetals Corporation
CY Carbide Mfg. Co. Ltd.
Durit HartMetall GmBH
Element Six
Federal Carbide Company
H.C. Stark GmbH
Kennametal Inc.
Mitsubishi Materials Corporation
Rock River Tool Inc.
Sandvik AB
Sumitomo Electric Industries
Ltd.
Wolfram Company JSC