There are three categories of treaties adopted by the World Intellectual Property Organization. (Classification Treaties) Locarno agreement for establishing an international classification for industrial designs. Nice agreement concerning the international classification of goods and services for the purposes of the registration of marks (hereinafter referred to as "Nice Agreement") was concluded in Nice in 1957 and finally revised in Geneva in 1977. Strasbourg agreement concerning the international patent classification. Vienna agreement establishing an international classification of the graphic elements of trademarks. In addition, the Agreement on Trade-Related Aspects of Intellectual Property Rights of the World Trade Organization, which was concluded in Malagasy in April 1994, is a major intellectual property treaty outside the management of the World Intellectual Property Organization, and it came into force in January 1995.