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Application filed by А.И. Дюжев-Кровеков, П.М. Дюжев-КровековfiledCriticalА.И. Дюжев-Кровеков
Priority to SU348942ApriorityCriticalpatent/SU75683A2/ru
Application grantedgrantedCritical
Publication of SU75683A2publicationCriticalpatent/SU75683A2/ru