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Priority claimed from NO817/72Aexternal-prioritypatent/NO135195C/no
Publication of NO752101LpublicationCriticalpatent/NO752101L/no
Application filed by Allegheny Ludlum Ind IncfiledCriticalAllegheny Ludlum Ind Inc
Publication of NO135764BpublicationCriticalpatent/NO135764B/no
Publication of NO135764CpublicationCriticalpatent/NO135764C/no