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Priority to JP7116285UpriorityCriticalpatent/JPH0137148Y2/ja
Priority to US06/831,214prioritypatent/US4676332A/en
Priority to GB08604317Aprioritypatent/GB2172688B/en
Publication of JPS61186721UpublicationCriticalpatent/JPS61186721U/ja
Application grantedgrantedCritical
Publication of JPH0137148Y2publicationCriticalpatent/JPH0137148Y2/ja