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Priority to JP7639479UpriorityCriticalpatent/JPS6142294Y2/ja
Priority to US06/144,936prioritypatent/US4311896A/en
Publication of JPS55175991UpublicationCriticalpatent/JPS55175991U/ja
Application grantedgrantedCritical
Publication of JPS6142294Y2publicationCriticalpatent/JPS6142294Y2/ja