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Priority claimed from GB8312719Aexternal-prioritypatent/GB2133148A/en
Application filed by Seismograph Service EnglandfiledCriticalSeismograph Service England
Publication of NO834389LpublicationCriticalpatent/NO834389L/en
Publication of NO166259BpublicationCriticalpatent/NO166259B/en
Publication of NO166259CpublicationCriticalpatent/NO166259C/en