Ключевые слова: building, business, communication, concept, construction, contracting, contractor, counsel, electrician, electronic, engineer, engineering, engineers, equipment, expert, facility, factory, field, foreman, general, hardhat, helmet, industrial, industry, infrastructure, job, machine, machinery, maintenance, man, management, manager, occupation, oil, people, person, portrait, protection, safety, smile, supervisor, survey, system, technicians, warehouse, woman, worker, workers, working, yellow,