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2, 30-35, 30-40, 30's, 30s, 35-40, 40-45, 40-50, 40's, 40s, 45-50, 50-55, 50-60, 55-60, adult, apparatus, britain, business, capital, collaborating, color, colour, commerce, e.u., elevated view, english, equipment, eu, europe, european, european union, examining, fellow, fifties, fifty, forties, forty, gentleman, great britain, guy, high angle, human, human being, indoor, industrial plant, industrialization, inside, inspection, lab, machine, male, manufacture, manufacturing plant, mid life, middle age, middle aged, middle-age, middle-aged, observing, person, plant, research, science, scrutinizing, seriousness, solemn, somber, spectating, spectator, team, thirties, thirty, three-quarter length, toiling, trade, two, u.k., uk, viewing, waist-up, western europe, western european, white coat, work,