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 filed by Ф.Ф. НавратилfiledCriticalФ.Ф. Навратил
Priority to SU29172ApriorityCriticalpatent/SU14111A1/en
Application grantedgrantedCritical
Publication of SU14111A1publicationCriticalpatent/SU14111A1/en