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Priority to JP13786887UpriorityCriticalpatent/JPH0447545Y2/ja
Priority to US07/184,013prioritypatent/US4887522A/en
Priority to US07/309,102prioritypatent/US4876952A/en
Publication of JPS6441834UpublicationCriticalpatent/JPS6441834U/ja
Priority to US07/393,487prioritypatent/US4991496A/en
Application grantedgrantedCritical
Publication of JPH0447545Y2publicationCriticalpatent/JPH0447545Y2/ja