International Patent Classification 1 [vynechat] air pollutant emission 1 [vynechat] chemistry 1 [vynechat] chémia 1 [vynechat] emisie znečisťujúcich látok 1 [vynechat] environmental protection 1 [vynechat] greenhouse gases 1 [vynechat] medzinárodné patentové triedenie 1 [vynechat] metallurgy 1 [vynechat] metalurgia 1 [vynechat] ochrana životného prostredia 1 [vynechat] paper 1 [vynechat] papier 1 [vynechat] patent licenses 1 [vynechat] patenty 1 [vynechat] skleníkové plyny 1 [vynechat] textil 1 [vynechat] textile 1 [vynechat]