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Priority claimed from GB31386/68Aexternal-prioritypatent/GB1255933A/en
Application filed by Lansing Bagnall LtdfiledCriticalLansing Bagnall Ltd
Publication of IE33180LpublicationCriticalpatent/IE33180L/en
Publication of IE33180B1publicationCriticalpatent/IE33180B1/en