Ключевые слова: 20s, 60s, apprentice, apprenticeship, caucasian, drag, drill, drilling, engineer, engineering, factory, glasses, indoors, industry, learning, machine, machinery, male, manual, manufacturing, men, milling, occupation, operating, overalls, people, person, precision, safety, sixties, skilled, teaching, together, training, twenties, two, worker, working, workman, workshop,