Ключевые слова: aged, antique, attention, beware, caution, danger, dangerous, dirty, embossed, enamel, enamel sign, german, grade, grunge, grungy, hazard, isolated, message, metal, nostalgic, occupational safety, old, panel, patina, plate, regulation, retro, risk, rust, rusted, rustic, rusty, safety, safety sign, scratch, sign, signboard, tin, vintage, warning, warning sign, weathered, white background, worn,