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Priority to JP1987069183UpriorityCriticalpatent/JPH0732050Y2/ja
Publication of JPS63179130UpublicationCriticalpatent/JPS63179130U/ja
Priority to US07/855,482prioritypatent/US5237918A/en
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Publication of JPH0732050Y2publicationCriticalpatent/JPH0732050Y2/ja