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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Application filedfiledCritical
Priority to CS553273ApriorityCriticalpatent/CS167020B1/cs
Priority to HUVI000990prioritypatent/HU170096B/hu
Priority to DD180005Aprioritypatent/DD116682A1/xx
Priority to BG2733474Aprioritypatent/BG25943A1/xx
Priority to SU742501073Aprioritypatent/SU640295A1/ru
Publication of CS167020B1publicationCriticalpatent/CS167020B1/cs