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Application filed by Н.А. Маслянский, нский Н.А. МаслfiledCriticalН.А. Маслянский
Priority to SU70587ApriorityCriticalpatent/SU28268A1/en
Application grantedgrantedCritical
Publication of SU28268A1publicationCriticalpatent/SU28268A1/en