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2, 20-25, 20-30, 20's, 20s, 25-30, 40-45, 40-50, 40's, 40s, 45-50, 50-55, 50-60, 55-60, adult, apparatus, asian, associate, britain, business, capital, collaborating, colleague, color, colour, commerce, conference, daylight, daytime, e.u., english, equipment, eu, europe, european, european union, far eastern, fellow, female, fifties, fifty, forties, forty, gal, gathering, gentleman, great britain, guy, human, human being, indoor, industrial plant, industrialization, inside, inspection, lab, lady, low angle, machine, male, manufacture, manufacturing plant, mid life, middle age, middle aged, middle-age, middle-aged, oriental, person, plant, production-line, r&d, research and development, scrutinizing, team, three-quarter length, toiling, trade, twenties, twenty, two, u.k., uk, western europe, western european, white coat, women, work,