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 filed by А.Х. Вальдштейн, И.А. ШейдинfiledCriticalА.Х. Вальдштейн
Priority to SU3304ApriorityCriticalpatent/SU69480A1/en
Application grantedgrantedCritical
Publication of SU69480A1publicationCriticalpatent/SU69480A1/en