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Priority to JP11060287UpriorityCriticalpatent/JPS6418028U/ja
Priority to US07/217,873prioritypatent/US4924999A/en
Priority to IT8848216Aprioritypatent/IT1224518B/it
Priority to DE3824874Aprioritypatent/DE3824874A1/de
Publication of JPS6418028UpublicationCriticalpatent/JPS6418028U/ja