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Priority to JP1987139674UpriorityCriticalpatent/JPH0624605Y2/ja
Priority to PCT/JP1988/000806prioritypatent/WO1989002551A1/ja
Publication of JPS6443260UpublicationCriticalpatent/JPS6443260U/ja
Priority to US07/541,175prioritypatent/US4987980A/en
Application grantedgrantedCritical
Publication of JPH0624605Y2publicationCriticalpatent/JPH0624605Y2/ja