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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, ability, adult, apparatus, asian, associate, britain, business, capital, collaborating, colleague, color, colour, commerce, e.u., english, equipment, eu, europe, european, european union, expert, far eastern, fellow, female, fifties, fifty, forties, forty, gal, gentleman, great britain, guy, head & shoulders, human, human being, indoor, industrial plant, industrialization, inside, inspection, know-how, lady, male, manufacture, manufacturing plant, mid life, middle age, middle aged, middle-age, middle-aged, oriental, person, plant, production-line, science, scrutinizing, team, technique, three-quarter length, toiling, trade, twenties, twenty, two, u.k., uk, western europe, western european, white coat, women, work,