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Priority to JP1987164810UpriorityCriticalpatent/JPH0738721Y2/ja
Publication of JPH0169902UpublicationCriticalpatent/JPH0169902U/ja
Priority to US07/499,031prioritypatent/US5048395A/en
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Publication of JPH0738721Y2publicationCriticalpatent/JPH0738721Y2/ja
