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 И.В. Виноградова, Е.И. МатвееваfiledCriticalИ.В. Виноградова
Priority to SU374888ApriorityCriticalpatent/SU75443A1/en
Application grantedgrantedCritical
Publication of SU75443A1publicationCriticalpatent/SU75443A1/en