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Priority to JP13723585UpriorityCriticalpatent/JPH0427201Y2/ja
Priority to US06/902,869prioritypatent/US4725798A/en
Publication of JPS6244503UpublicationCriticalpatent/JPS6244503U/ja
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Publication of JPH0427201Y2publicationCriticalpatent/JPH0427201Y2/ja