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Priority to JP1987141437UpriorityCriticalpatent/JP2520681Y2/ja
Priority to DE3831425Aprioritypatent/DE3831425C2/de
Priority to US07/245,416prioritypatent/US4962999A/en
Publication of JPS6445319UpublicationCriticalpatent/JPS6445319U/ja
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Publication of JP2520681Y2publicationCriticalpatent/JP2520681Y2/ja