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Priority to JP13173987UpriorityCriticalpatent/JPH0610772Y2/ja
Publication of JPS6438963UpublicationCriticalpatent/JPS6438963U/ja
Priority to US07/507,797prioritypatent/US5020738A/en
Application grantedgrantedCritical
Publication of JPH0610772Y2publicationCriticalpatent/JPH0610772Y2/ja
Priority to US09/299,907prioritypatent/US6216969B1/en