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Priority to JP1985185136UpriorityCriticalpatent/JPH0235562Y2/ja
Priority to US06/936,506prioritypatent/US4772799A/en
Publication of JPS6291768UpublicationCriticalpatent/JPS6291768U/ja
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Publication of JPH0235562Y2publicationCriticalpatent/JPH0235562Y2/ja