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Priority to JP9168ApriorityCriticalpatent/JPS493398B1/ja
Priority to GB949268Aprioritypatent/GB1221823A/en
Priority to DE19681717182prioritypatent/DE1717182C/de
Priority to NL6803049Aprioritypatent/NL6803049A/xx
Priority to BE711699Dprioritypatent/BE711699A/xx
Priority to CH950468Aprioritypatent/CH507357A/de
Publication of JPS493398B1publicationCriticalpatent/JPS493398B1/ja