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Application filed by Mine Safety Appliances CofiledCriticalMine Safety Appliances Co
Priority to IT8721705ApriorityCriticalpatent/IT1221953B/it
Publication of IT8721705A0publicationCriticalpatent/IT8721705A0/it
Application grantedgrantedCritical
Publication of IT1221953BpublicationCriticalpatent/IT1221953B/it