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Priority claimed from CA000444272Aexternal-prioritypatent/CA1229435A/en
Priority claimed from CA000444271Aexternal-prioritypatent/CA1229434A/en
Application filed by Northern Telecom LtdfiledCriticalNorthern Telecom Ltd
Priority claimed from EP84308372Aexternal-prioritypatent/EP0147086B1/de
Application grantedgrantedCritical
Publication of ATE61896T1publicationCriticalpatent/ATE61896T1/de