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Priority claimed from GB54353/77Aexternal-prioritypatent/GB1582580A/en
Application filed by Bfg GlassgroupfiledCriticalBfg Glassgroup
Publication of IT7869934A0publicationCriticalpatent/IT7869934A0/it
Application grantedgrantedCritical
Publication of IT1108386BpublicationCriticalpatent/IT1108386B/it