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.)
Filing date
Publication date
Application filedfiledCritical
Priority to DD16606672ApriorityCriticalpatent/DD103774A1/xx
Priority to HUFU000319prioritypatent/HU167755B/hu
Priority to SU7301968613Aprioritypatent/SU567207A1/ru
Priority to CS691473Aprioritypatent/CS177485B1/cs
Publication of DD103774A1publicationCriticalpatent/DD103774A1/xx