Ключевые слова: aqua, art, clean, contour, control, drop, engineering, equipment, finger, forbidden, gas, glove, hand, icon, illustration, industrial, industry, isolated, latex, line, linear, lineart, liquid, metal, no, oil, outline, pipe, pipeline, plumbing, pressure, prohibited, prohibition, protection, protective, rubber, safety, sign, steel, stop, symbol, system, technology, tube, valve, water, wet, work,