Ключевые слова: 30 to 34 years, 3034 years, accuracy, caucasian ethnicity, concentration, determination, differential focus, earmuff, grinder, grinding, indoors, industrial building, industrial facility, industry, looking down, machine, machinist, male, man, men, mid adult, mid adult man, mid adult men, numeral, october 2016 release, one person, only one mid adult man, orthographic symbol, planning, precision, preparation, protection, safety, security, selective focus, shirt, skill, symbol, technology, thinking, tshirt, waist up, wearing, work tool, working, workshop,