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Priority to JP1988066420UpriorityCriticalpatent/JPH0637338Y2/ja
Priority to US07/322,150prioritypatent/US4912398A/en
Priority to GB8906193Aprioritypatent/GB2217855B/en
Priority to DE3912048Aprioritypatent/DE3912048A1/de
Priority to CN 89102388prioritypatent/CN1012592B/zh
Publication of JPH01168875UpublicationCriticalpatent/JPH01168875U/ja
Application grantedgrantedCritical
Publication of JPH0637338Y2publicationCriticalpatent/JPH0637338Y2/ja