Л. П. Козлов В. Г. Колосов Н. И. Колосова изобрете В. Н. Алексеев
С. П. Некрасов
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М. И. Калинина
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Application filed by М. И. КалининаfiledCriticalМ. И. Калинина
Priority to SU1781582ApriorityCriticalpatent/SU428555A1/ru
Application grantedgrantedCritical
Publication of SU428555A1publicationCriticalpatent/SU428555A1/ru