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Priority to JP1988161637UpriorityCriticalpatent/JPH0298019U/ja
Priority to US07/440,378prioritypatent/US4937980A/en
Priority to DE3941043Aprioritypatent/DE3941043C2/de
Priority to GB8928204Aprioritypatent/GB2227042B/en
Publication of JPH0298019UpublicationCriticalpatent/JPH0298019U/ja