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GB255078A
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Improvements in processes of manufacturing chromates and manganates
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GB224235A
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Improvements in processes of mechanically roasting ore
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GB211507A
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Improvements in the manufacture of salts of chrome
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GB209757A
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Improvements in the manufacture of zinc sulphide
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DE409478C
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Manufacture of titanic acid
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DE443087C
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Production of pure, crystallized titanic acid which can preferably be used as a dye
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DE500626C
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Process for the production of a white dye
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