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Priority to JP1985040769UpriorityCriticalpatent/JPH0237370Y2/ja
Priority to US06/841,325prioritypatent/US4710995A/en
Publication of JPS61156526UpublicationCriticalpatent/JPS61156526U/ja
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Publication of JPH0237370Y2publicationCriticalpatent/JPH0237370Y2/ja