Ключевые слова: 20s, 40s, 50s, apprentice, apprenticeship, busy, caucasian, engineer, engineering, equipment, factory, fifties, forties, horizontal, indoors, industry, learning, machine, machinery, male, man, manual worker, manufacturing, men, occupation, operating, overalls, people, person, precision, skilled, staff, teaching, team, three people, together, trainee, training, twenties, working, workman, workshop,