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Priority to JP1987153543UpriorityCriticalpatent/JPH0646797Y2/ja
Priority to US07/254,304prioritypatent/US4962717A/en
Publication of JPH0157994UpublicationCriticalpatent/JPH0157994U/ja
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Publication of JPH0646797Y2publicationCriticalpatent/JPH0646797Y2/ja