International Patent Classification 15 [vynechat] medzinárodné patentové triedenie 15 [vynechat] patent licenses 14 [vynechat] patenty 14 [vynechat] chemistry 1 [vynechat] chémia 1 [vynechat] construction industry 1 [vynechat] doprava 1 [vynechat] electric engineering 1 [vynechat] elektrotechnika 1 [vynechat] fyzika 1 [vynechat] human need 1 [vynechat] industrial patents 1 [vynechat] mechanics 1 [vynechat] mechanika 1 [vynechat] metallurgy 1 [vynechat] metalurgia 1 [vynechat] paper 1 [vynechat] papier 1 [vynechat] physics 1 [vynechat] priemyselné vzory 1 [vynechat] stavebníctvo 1 [vynechat] technika 1 [vynechat] technology 1 [vynechat] textil 1 [vynechat] textile 1 [vynechat] transportation 1 [vynechat] ľudské potreby 1 [vynechat]