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 Предприятие П/Я М-5973, Московский инженерно-строительный институтfiledCriticalПредприятие П/Я М-5973
Priority to SU772506555ApriorityCriticalpatent/SU642440A2/en
Application grantedgrantedCritical
Publication of SU642440A2publicationCriticalpatent/SU642440A2/en