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Application filed by Toshiba Ceramics Co, Sumitomo Metal IndfiledCriticalToshiba Ceramics Co
Priority to IT20416/85ApriorityCriticalpatent/IT1184756B/it
Publication of IT8520416A0publicationCriticalpatent/IT8520416A0/it
Application grantedgrantedCritical
Publication of IT1184756BpublicationCriticalpatent/IT1184756B/it