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Application filed by Henry H WelchfiledCriticalHenry H Welch
Priority to IT48469/80ApriorityCriticalpatent/IT1127588B/it
Publication of IT8048469A0publicationCriticalpatent/IT8048469A0/it
Application grantedgrantedCritical
Publication of IT1127588BpublicationCriticalpatent/IT1127588B/it