Сандық абоненттік желі (Kazakh Wikipedia)

Analysis of information sources in references of the Wikipedia article "Сандық абоненттік желі" in Kazakh language version.

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Andrew R. Reichert, William J. Schirmer, Nicholas M. Esser, Bradley R. Nelson, Lauren T. May, Stewart C. Brown System for communicating digital data on a standard office telephone system. US Patent 4,785,448. Filed ақпан 23, 1987. Issued November 15, 1988.