Ключевые слова: blue, business, busy, construction, controls, devices, energy, engineering, equipment, explains, fabricator, factory, glasses, heat, heating plant, helmet, hot, industrial, industry, interior, jobs, look, machinery, machinist, man, manufacturing, mechanical, metal, occupation, operation, pipe, planning, plant, power, production, protection, protective, talk, tank, turn, valve, vent, watch, work, work wear, worker, workman,