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Priority to JP1987145869UpriorityCriticalpatent/JPH0440519Y2/ja
Priority to US07/224,652prioritypatent/US4913494A/en
Publication of JPS6449142UpublicationCriticalpatent/JPS6449142U/ja
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Publication of JPH0440519Y2publicationCriticalpatent/JPH0440519Y2/ja