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Priority to JP1987113457UpriorityCriticalpatent/JPH0528191Y2/ja
Priority to DE3814256Aprioritypatent/DE3814256C2/de
Priority to US07/296,851prioritypatent/US4863056A/en
Publication of JPS6417930UpublicationCriticalpatent/JPS6417930U/ja
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Publication of JPH0528191Y2publicationCriticalpatent/JPH0528191Y2/ja