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Priority claimed from GB41874/77Aexternal-prioritypatent/GB1588362A/en
Application filed by Wallace Ltd H GfiledCriticalWallace Ltd H G
Publication of IT7851382A0publicationCriticalpatent/IT7851382A0/it
Application grantedgrantedCritical
Publication of IT1157359BpublicationCriticalpatent/IT1157359B/it