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Priority to JP1988024973UpriorityCriticalpatent/JPH0633270Y2/ja
Priority to CA000588878Aprioritypatent/CA1319668C/en
Publication of JPH01132879UpublicationCriticalpatent/JPH01132879U/ja
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Publication of JPH0633270Y2publicationCriticalpatent/JPH0633270Y2/ja