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Priority to JP1968019947UpriorityCriticalpatent/JPS4530914Y1/ja
Priority to GB1332369Aprioritypatent/GB1240938A/en
Priority to NL6903878Aprioritypatent/NL168675C/xx
Priority to DE19691912834prioritypatent/DE1912834A1/de
Priority to FR6907169Aprioritypatent/FR2003830A1/fr
Publication of JPS4530914Y1publicationCriticalpatent/JPS4530914Y1/ja