... two or mote rare earth oxide Proprietaty-Compound Tungsten electrode is the Tungsten material with two or mote rare earth ... R&D,BTMMF is presided over the Proprietary-Compound electrodes project (which is one of the State ... and American, and become the noble in the Tungsten electrodes family. On Jan. 2006, this product ... project supported by the government. Proprietary-Compound Tungsten electrode