our leading products include: 1. mosfet solid state h.f. welders, braze welding, quenching, hot charging, and smelting series products. 2. igbt solid state super audio, scr i.f. induction heating and heat treatment complete sets. 3. vacuum tube h.f. welder and heat treatment series products. 4. tnc, microcomputer control thyristor dc speed regulating, large power dc source series products. 5. cnc, plc specification and non-standard quenching machines, electric control complete sets. 6. h.v., l.v. net suppression of harmonics and reactive compensation series products, h.v., l.v. copper core reactor series products.