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Priority to JP8019290UpriorityCriticalpatent/JP2508641Y2/ja
Priority to US07/647,731prioritypatent/US5181197A/en
Publication of JPH0439891UpublicationCriticalpatent/JPH0439891U/ja
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Publication of JP2508641Y2publicationCriticalpatent/JP2508641Y2/ja
Priority to US09/286,367prioritypatent/USRE38226E1/en