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Priority to JP1989104715UpriorityCriticalpatent/JPH0523408Y2/ja
Priority to CA 2024561prioritypatent/CA2024561A1/en
Publication of JPH0344611UpublicationCriticalpatent/JPH0344611U/ja
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Publication of JPH0523408Y2publicationCriticalpatent/JPH0523408Y2/ja