Ключевые слова: african, african american, american, business, canal, checklist, clipboard, coated, construction, construction worker, control, development, engineer, engineering, equipment, examine, examining, factory, foreman, hardhat, helmet, horizontal, industrial, industry, inspector, labor, machine, man, manufacture, manufacturing, measuring, mechanic, metal, occupation, person, pipe, professional, quality, repairing, safety, steel, technician, technology, tube, warehouse, water pipe, work, worker, workshop,