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Priority to JP14749789UpriorityCriticalpatent/JPH0639690Y2/ja
Priority to DE4020029Aprioritypatent/DE4020029C2/de
Publication of JPH0385017UpublicationCriticalpatent/JPH0385017U/ja
Priority to US07/753,643prioritypatent/US5323770A/en
Priority to US07/914,507prioritypatent/US5246367A/en
Application grantedgrantedCritical
Publication of JPH0639690Y2publicationCriticalpatent/JPH0639690Y2/ja