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Priority to JP2616481UpriorityCriticalpatent/JPH0123882Y2/ja
Priority to US06/348,671prioritypatent/US4438701A/en
Priority to GB8204945Aprioritypatent/GB2093420B/en
Publication of JPS57141912UpublicationCriticalpatent/JPS57141912U/ja
Application grantedgrantedCritical
Publication of JPH0123882Y2publicationCriticalpatent/JPH0123882Y2/ja