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Priority to JP6336270UpriorityCriticalpatent/JPS494427Y1/ja
Priority to US00153180Aprioritypatent/US3741583A/en
Priority to GB2793471Aprioritypatent/GB1301607A/en
Priority to SE07992/71Aprioritypatent/SE360606B/xx
Priority to CA116491Aprioritypatent/CA926441A/en
Priority to DE19712131479prioritypatent/DE2131479C3/de
Publication of JPS494427Y1publicationCriticalpatent/JPS494427Y1/ja