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DK496161AA1960-12-231961-12-12Fremgangsmåde til udvinding og rensning af vitamin B12 fra en vandig opløsning af vitamin B12-holdigt celleindhold.
DK101192C
(da)
Fremgangsmåde til udvinding af 2-methyl-5-vinylpyridin fra blandinger, som består af eller indeholder 2-methyl-5-vinylpyridin og 2-methyl-5-ethylpyridin.