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Priority to JP8109379UpriorityCriticalpatent/JPS6123793Y2/ja
Priority to US06/148,465prioritypatent/US4419888A/en
Priority to EP80103210Aprioritypatent/EP0021225A1/en
Priority to CA000353877Aprioritypatent/CA1149635A/en
Publication of JPS55181538UpublicationCriticalpatent/JPS55181538U/ja
Application grantedgrantedCritical
Publication of JPS6123793Y2publicationCriticalpatent/JPS6123793Y2/ja