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 DD18407975ApriorityCriticalpatent/DD117366A1/xx
Publication of DD117366A1publicationCriticalpatent/DD117366A1/xx
Priority to HU76UO115Aprioritypatent/HU174085B/hu
Priority to CS86976Aprioritypatent/CS185890B1/cs
Priority to SU762320504Aprioritypatent/SU651873A1/ru
