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Priority to JP10123072UpriorityCriticalpatent/JPS5239938Y2/ja
Priority to US00392401Aprioritypatent/US3835236A/en
Publication of JPS4959520UpublicationCriticalpatent/JPS4959520U/ja
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Publication of JPS5239938Y2publicationCriticalpatent/JPS5239938Y2/ja