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Priority to JP49068928ApriorityCriticalpatent/JPS50157502A/ja
Priority to DE19742432981prioritypatent/DE2432981A1/de
Priority to DD18009774Aprioritypatent/DD112794A5/xx
Priority to FR7426471Aprioritypatent/FR2245810A1/fr
Priority to IT2573174Aprioritypatent/IT1017725B/it
Publication of JPS50157502ApublicationCriticalpatent/JPS50157502A/ja