Langbaidi Electric Co., Ltd.

[ Manufacturer ]Main business are Power system relay protection device, Industrial test instrument, Capacitor protective device, Power equipment internal and external fault infrared diagnostic instrument.

Beijing Ailao Hi-tech Co., Ltd.

[ Manufacturer ]Main business are Semiconductor lightning current-duration extender, Conductor lightning current-duration extender, High-energy surge voltage eliminator, Telephone line, Audio cable protector, Signal line, Antenna, Data line protector, Power three-time harmonic , High stab