Harmonized System

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Section VI > Chapter 28 > Heading 2833

Explanatory notes

… which fall in heading 28.52, ammonium sulphate which, even pure, falls in heading 31.02 or  31.05 and potassium …

Section VI > Chapter 29 > Heading 2915

Explanatory notes

… carboxylic acids (RCOOH + H 2 O = RC(OH) 3 ). In practice, however, these do not exist in the free state, but they do …

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