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On approval of the professional standard "Installer of lifting cranes": Order of the Ministry of Labor and Social Protection of the Russian Federation dated 04.17.2018 No. 251n.- electronic text data (25 files).-(Moscow: Glavnivz UDP of the Russian Federation, 2018).-Access mode: Internet portal of the presidential library.Plug.From the title page.Electronic version: Order of the Ministry of Labor and Social Protection of the Russian Federation dated 04/17/2018 No. 251n "On approval of the professional standard" Installer of lifting cranes "..Electronic copy source: PB