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Priority to JP1981057912UpriorityCriticalpatent/JPH0326578Y2/ja
Priority to US06/357,475prioritypatent/US4430532A/en
Priority to GB8207581Aprioritypatent/GB2096831B/en
Publication of JPS57171225UpublicationCriticalpatent/JPS57171225U/ja
Application grantedgrantedCritical
Publication of JPH0326578Y2publicationCriticalpatent/JPH0326578Y2/ja