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Priority claimed from CA 503968external-prioritypatent/CA1277164C/en
Application filed by Northern Telecom LtdfiledCriticalNorthern Telecom Ltd
Priority claimed from EP87301676Aexternal-prioritypatent/EP0237236B1/de
Application grantedgrantedCritical
Publication of ATE99809T1publicationCriticalpatent/ATE99809T1/de