3913 Natural Polymers, E.g. Alginic Acid, and Modified Natural Polymers, E.g. Hardened Proteins, Chemical Derivatives of Natural Rubber, N.e.s., in Primary Forms

3913 (01/1988-..) Natural Polymers, E.g. Alginic Acid, and Modified Natural Polymers, E.g. Hardened Proteins, Chemical Derivatives of Natural Rubber, N.e.s., in Primary Forms 39131000 (01/1988-..) Alginic Acid, its Salts and Esters, in Primary Forms 39139000 (01/2004-..) Natural Polymers and Modified Natural Polymers, E.g. Hardened Proteins, Chemical Derivatives of Natural Rubber, N.e.s., in Primary Forms (Excl. Alginic Acid and its Salts and Esters) 39139010 (01/1988-12/2003) Chemical Derivatives of Natural Rubber, in Primary Forms 39139020 (01/1992-12/2003) Amylopektin, in Primary Forms 39139030 (01/1992-12/2003) Amylose, in Primary Forms 39139080 (01/1992-12/2003) Natural Polymers and Modified Natural Polymers, E.g. Hardened Proteins, N.e.s., in Primary Forms (Excl. Chemical Derivatives of Natural Rubber, Alginic Acid, its Salts and Esters, and Amylopektin and Amylose) 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)