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Priority to JP18938580UpriorityCriticalpatent/JPS6232787Y2/ja
Priority to US06/314,419prioritypatent/US4504769A/en
Priority to DE19813142749prioritypatent/DE3142749A1/de
Publication of JPS57112881UpublicationCriticalpatent/JPS57112881U/ja
Application grantedgrantedCritical
Publication of JPS6232787Y2publicationCriticalpatent/JPS6232787Y2/ja