Since 2003, Hui sets of the original electronic equipment factory roads lead to Beijing, Xi'an surplus Andrew John HUNTER-plant equipment, such as four large (companies) more than 10 senior technical professionals, with a total investment of more than 300 million on R & D products , Experimental investigation and social practice, extensively solicit the views of traders and users, under the premise of continuous technical research, After modification, upgrade, has finally formed a matching No. 4 and Sparta "Yixian Tong" electronic surveillance products.

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