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Priority claimed from US06/338,967external-prioritypatent/US4471893A/en
Application filed by Seaquist Valve CofiledCriticalSeaquist Valve Co
Publication of IT8249108A0publicationCriticalpatent/IT8249108A0/it
Application grantedgrantedCritical
Publication of IT1149346BpublicationCriticalpatent/IT1149346B/it