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AT&T_Switching_Center?oldid=995259293&ns=0
AT&T_Switching_Center?oldid=995259293&ns=0
http://en.wikipedia.org/wiki/AT&T_Switching_Center?oldid=995259293&ns=0
AT&T Switching Center
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AT&T_Switching_Center?oldid=995259293&ns=0
http://en.wikipedia.org/wiki/AT&T_Switching_Center?oldid=995259293&ns=0