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Priority to JP1968012235UpriorityCriticalpatent/JPS4719773Y1/ja
Priority to GB5138/69Aprioritypatent/GB1249732A/en
Priority to FR6902274Aprioritypatent/FR2001321A1/fr
Priority to NL696901744Aprioritypatent/NL144029B/xx
Priority to US257418Aprioritypatent/US3858487A/en
Publication of JPS4719773Y1publicationCriticalpatent/JPS4719773Y1/ja