SWITCHING SYSTEM
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720,000 Lines Switching System for Tianjin, Changchun, Harbin, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong and Xi'an,1991-1997720,000 Lines Switching System for Tianjin, Changchun, Harbin, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong and Xi'an,1991-1997
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