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Priority to JP1987188039UpriorityCriticalpatent/JPH0612638Y2/ja
Priority to US07/176,308prioritypatent/US4797122A/en
Priority to CA000563150Aprioritypatent/CA1287138C/en
Publication of JPH0192082UpublicationCriticalpatent/JPH0192082U/ja
Application grantedgrantedCritical
Publication of JPH0612638Y2publicationCriticalpatent/JPH0612638Y2/ja