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Application filed by Л.С. Эрастов-СлуцкийfiledCriticalЛ.С. Эрастов-Слуцкий
Priority to SU137074ApriorityCriticalpatent/SU37216A1/ru
Application grantedgrantedCritical
Publication of SU37216A1publicationCriticalpatent/SU37216A1/ru