Э. А. Абраменков Институт горного дела Сибирского отделени СССР
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Application filed by Н. А. Клушин, Э. П. Варнелло, П. А. Маслаков, Э. А. Абраменков Институт горного дела Сибирского отделени СССРfiledCriticalН. А. Клушин
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Publication of SU425661A1publicationCriticalpatent/SU425661A1/ru