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Detail from a 1959 Decca ad
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1925 illustration by Charles E Turner
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1922 Bowater Paper ad
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Detail from a 1949 Roebling ad
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Details from a 1949 Westinghouse ad
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Tapping A Steel Furnace by Frank Mason
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1953 Docker Brothers ad
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1949 British Electricity ad
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1952 Reed Paper ad
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1961 Ferranti ad
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1952 Monotype Keyboard ad