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Priority to JP1988094703UpriorityCriticalpatent/JPH0425766Y2/ja
Priority to US07/380,982prioritypatent/US4972302A/en
Publication of JPH0216505UpublicationCriticalpatent/JPH0216505U/ja
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Publication of JPH0425766Y2publicationCriticalpatent/JPH0425766Y2/ja