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Priority to JP1974057922UpriorityCriticalpatent/JPS5533850Y2/ja
Priority to US05/577,552prioritypatent/US3990131A/en
Publication of JPS50146920UpublicationCriticalpatent/JPS50146920U/ja
Application grantedgrantedCritical
Publication of JPS5533850Y2publicationCriticalpatent/JPS5533850Y2/ja