Shanghai 194 Shuang 194 Dian 194 Electric 194 Co 194 Ltd Shanghai 194 Shuang 194 Dian 194 Electric 194 Co 194 Ltd 194 has 194 produced 194 harmonic 194 filters 194 with 194 ratings 194 up 194 to 194 690 194 V 194 and 194 is 194 a 194 China 226€™s 194 leader 194 in 194 research 194 and 194 development 194 of 194 tomorrow 226€™s 194 harmonic 194 filter 194 technology