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Application filed by Helix SrlfiledCriticalHelix Srl
Priority to IT67628/80ApriorityCriticalpatent/IT1128428B/it
Publication of IT8067628A0publicationCriticalpatent/IT8067628A0/it
Priority to DE19813110396prioritypatent/DE3110396A1/de
Priority to FR8107796Aprioritypatent/FR2480832A1/fr
Application grantedgrantedCritical
Publication of IT1128428BpublicationCriticalpatent/IT1128428B/it