Rahvusvaheline patendiklassifikatsioon. Valdkond D, Tekstiilid; paber. Valdkond C, Keemia; metallurgia : klassid ja alaklassid
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URL: http://www.digar.ee/id/nlib-digar:120103
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URL: http://www.digar.ee/id/nlib-digar:120103
