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Section VII
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Chapter 39
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Heading 3913
Heading 3913
Natural polymers (e.g. alginic acid) and modified natural polymers (e.g. hardened proteins, chemical derivatives of natural rubber), n.e.c. or included, in primary forms
391310
Polymers, natural; alginic acid, its salts and esters, in primary forms
391390
Polymers, natural and modified natural; in primary forms (excluding alginic acid, its salts and esters)