Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to DD19368776ApriorityCriticalpatent/DD126416A1/xx
Priority to CS374777Aprioritypatent/CS204150B1/cs
Priority to SU772499159Aprioritypatent/SU667880A1/ru
Publication of DD126416A1publicationCriticalpatent/DD126416A1/xx
