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Priority to JP1987141777UpriorityCriticalpatent/JPH0547042Y2/ja
Priority to US07/243,748prioritypatent/US4925069A/en
Publication of JPS6447603UpublicationCriticalpatent/JPS6447603U/ja
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Publication of JPH0547042Y2publicationCriticalpatent/JPH0547042Y2/ja