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Application filed by Р.А. БиккенинfiledCriticalР.А. Биккенин
Priority to SU2781825/06ApriorityCriticalpatent/SU799576A1/ru
Application grantedgrantedCritical
Publication of RU799576CpublicationCriticalpatent/RU799576C/ru
Publication of SU799576A1publicationCriticalpatent/SU799576A1/ru