39139090 (01/1988-12/1991) Natural polymers and modified natural polymers, e.g. hardened proteins, n.e.s., in primary forms (excl. chemical derivatives of natural rubber, alginic acid and salts and esters thereof)
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39139090 (01/1988-12/1991) Natural polymers and modified natural polymers, e.g. hardened proteins, n.e.s., in primary forms (excl. chemical derivatives of natural rubber, alginic acid and salts and esters thereof)
