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Priority to JP2981781UpriorityCriticalpatent/JPS6120857Y2/ja
Priority to DE3206071Aprioritypatent/DE3206071C2/de
Priority to US06/350,351prioritypatent/US4491754A/en
Priority to CA000396962Aprioritypatent/CA1176296A/en
Publication of JPS57143867UpublicationCriticalpatent/JPS57143867U/ja
Application grantedgrantedCritical
Publication of JPS6120857Y2publicationCriticalpatent/JPS6120857Y2/ja