Ключевые слова: aged metal, archaeological find, architectural detail, circular form, construction element, construction history, corrosion art, cultural artifact, engineering artifact, foundry work, functional design, geometric design, historical detail, historical hardware, historical machinery, historical object, historical remnant, industrial archaeology, industrial artifact, industrial craftsmanship, industrial culture, industrial design, industrial heritage, industrial history, industrial relic, industrial remnant, iron oxide, manufacturing history, material aging, material decay, material science, mechanical part, metal composition, metal craft, metal decay, metallurgy study, metalwork detail, oxidation pattern, patina development, rust texture, square opening, structural element, structural hardware, surface texture, timeworn metal, vintage hardware, weathered metal, weathering pattern,