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The image shows a technical diagram of a surface gas flame hardening machine, hanging on a light grey wall next to an old electrical panel. The diagram, labeled "22", details different methods of hardening and features various illustrations of the equipment. Russian text, including "ПОВЕРХНОСТНАЯ ГАЗОПЛАМЕННАЯ ЗАКАЛКА" (Surface Gas Flame Hardening) and "СХЕМЫ СПОСОБОВ ЗАКАЛКИ" (Diagrams of Hardening Methods), is visible. The specific location is the Museum of Textile Industry in Sliven, Bulgaria.
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