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Priority to JP1981062770UpriorityCriticalpatent/JPS6244326Y2/ja
Priority to US06/369,777prioritypatent/US4438566A/en
Priority to GB8211870Aprioritypatent/GB2097928B/en
Priority to DE3216242Aprioritypatent/DE3216242C2/de
Publication of JPS57175003UpublicationCriticalpatent/JPS57175003U/ja
Application grantedgrantedCritical
Publication of JPS6244326Y2publicationCriticalpatent/JPS6244326Y2/ja