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Application filed by Е.С. Гуревич, Н.П. ЗиминfiledCriticalЕ.С. Гуревич
Priority to SU141881ApriorityCriticalpatent/SU38844A1/ru
Application grantedgrantedCritical
Publication of SU38844A1publicationCriticalpatent/SU38844A1/ru