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Application filed by Е. И. Кузнецов, Северо Западный заочный политехнический институтfiledCriticalЕ. И. Кузнецов
Priority to SU1727163ApriorityCriticalpatent/SU425302A1/ru
Application grantedgrantedCritical
Publication of SU425302A1publicationCriticalpatent/SU425302A1/ru