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Application filed by Е.Я. Калашников, Д.Б. ЛифшицfiledCriticalЕ.Я. Калашников
Priority to SU379231ApriorityCriticalpatent/SU75467A1/en
Application grantedgrantedCritical
Publication of SU75467A1publicationCriticalpatent/SU75467A1/en