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GB100250A
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Process and Apparatus for Evaporating Liquids.
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GB191116527A
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Method of Clarifying Tanning Extract Liquors, especially Quebracho Extract Liquors.
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GB191207389A
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Improved Manufacture of Quebracho Extracts.
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GB191028862A
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Improvements in the Manufacture of Sulphur Colouring Matters.
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US939742A
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Treatment of quebracho extract.
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GB190914516A
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Improved Treatment of Quebracho Extracts.
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GB190804358A
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Improvements in and relating to the Manufacture of Quebracho Extract.
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