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Priority to JP1985042366UpriorityCriticalpatent/JPH0445311Y2/ja
Publication of JPS61158783UpublicationCriticalpatent/JPS61158783U/ja
Priority to US07/110,537prioritypatent/US4903031A/en
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Publication of JPH0445311Y2publicationCriticalpatent/JPH0445311Y2/ja