Ключевые слова: abstract, afraid, bio, biological, black, breathe, caution, chemical, concept, danger, defense, design, equipment, filter, forces, gas, glass, green, grunge, headgear, helmet, icon, illustration, industrial, isolated, lab, life, mask, military, old, paper, protection, protective, red, respirator, retro, risk, round, safe, scalable, security, set, sign, symbol, vintage,