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Priority to JP1989053961UpriorityCriticalpatent/JPH081423Y2/ja
Priority to US07/520,468prioritypatent/US4993232A/en
Publication of JPH02147775UpublicationCriticalpatent/JPH02147775U/ja
Application grantedgrantedCritical
Publication of JPH081423Y2publicationCriticalpatent/JPH081423Y2/ja