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Priority claimed from IT21248/72Aexternal-prioritypatent/IT949752B/it
Application filed by Snam ProgettifiledCriticalSnam Progetti
Priority to AT567874ApriorityCriticalpatent/AT336557B/de
Publication of ATA567874ApublicationCriticalpatent/ATA567874A/de
Application grantedgrantedCritical
Publication of AT336557BpublicationCriticalpatent/AT336557B/de