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Priority to DD17918874ApriorityCriticalpatent/DD115765A1/xx
Priority to DE19752515514prioritypatent/DE2515514A1/de
Priority to GB2231375Aprioritypatent/GB1474155A/en
Priority to JP50062584Aprioritypatent/JPS513629A/ja
Publication of DD115765A1publicationCriticalpatent/DD115765A1/xx