Ключевые слова: african, american, analyze, architect, communication, confidence, confident, connect, contractor, control, danger, device, direction, distribution, electrician, employment, engine, engineer, engineering, equipment, facility, factory, foreman, hard, hard hat, helmet, industrial, industry, machine, machinery, maintenance, management, occupation, person, perspiration, professional, radio, safety, service, site, supervisor, sweat, system, technology, work, worker, working, workshop,