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Priority to JP1987176500UpriorityCriticalpatent/JPH0643771Y2/ja
Priority to US07/272,464prioritypatent/US4957112A/en
Publication of JPH0181617UpublicationCriticalpatent/JPH0181617U/ja
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Publication of JPH0643771Y2publicationCriticalpatent/JPH0643771Y2/ja