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Priority to JP1981052934UpriorityCriticalpatent/JPS6218353Y2/ja
Priority to US06/364,891prioritypatent/US4467517A/en
Priority to CA000400462Aprioritypatent/CA1191340A/en
Priority to GB8210728Aprioritypatent/GB2098104B/en
Publication of JPS57166637UpublicationCriticalpatent/JPS57166637U/ja
Application grantedgrantedCritical
Publication of JPS6218353Y2publicationCriticalpatent/JPS6218353Y2/ja