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Priority to JP6674969ApriorityCriticalpatent/JPS5021216B1/ja
Priority to GB46732/69Aprioritypatent/GB1248999A/en
Priority to DE19691948551prioritypatent/DE1948551A1/de
Priority to FR6933006Aprioritypatent/FR2019075A1/fr
Priority to NL696914653Aprioritypatent/NL143433B/xx
Publication of JPS5021216B1publicationCriticalpatent/JPS5021216B1/ja