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Priority to JP1977165292UpriorityCriticalpatent/JPS631412Y2/ja
Priority to GB7835351Aprioritypatent/GB2005438B/en
Priority to US05/939,704prioritypatent/US4223372A/en
Publication of JPS5490075UpublicationCriticalpatent/JPS5490075U/ja
Priority to US06/133,120prioritypatent/US4356533A/en
Application grantedgrantedCritical
Publication of JPS631412Y2publicationCriticalpatent/JPS631412Y2/ja