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Priority to JP1987070604UpriorityCriticalpatent/JPH0328871Y2/ja
Priority to US07/167,968prioritypatent/US4860676A/en
Publication of JPS63177471UpublicationCriticalpatent/JPS63177471U/ja
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Publication of JPH0328871Y2publicationCriticalpatent/JPH0328871Y2/ja