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Priority claimed from GB33989/75Aexternal-prioritypatent/GB1537471A/en
Application filed by Booth & Co Ltd W HfiledCriticalBooth & Co Ltd W H
Publication of NO762808LpublicationCriticalpatent/NO762808L/no
Publication of NO142944BpublicationCriticalpatent/NO142944B/no
Publication of NO142944CpublicationCriticalpatent/NO142944C/no