Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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International Standard Electric Corp
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International Standard Electric Corp
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Publication of DE2717874A1publicationCriticalpatent/DE2717874A1/de
Verfahren und Schaltungsanordnung zur Überprüfung der richtigen Durchschaltungsausführung einer Verbindung bei digitalen Datenübertragungssystemen, insbesondere digitalen Telefonsystemen
