TY - GEN CN - K1516 ET - Seventh edition. ID - 13052 KW - Patents. KW - Intellectual property. KW - WIPO DOCUMENTS : IPC UNION : GENERAL INFORMATION KW - PATENTS : INTERNATIONAL CLASSIFICATION LA - eng N1 - Cover title: International patent classification (seventh edition1999) general information. SN - 9280509071 T1 - General information on the seventh edition of the International Patent Classification (IPC). TI - General information on the seventh edition of the International Patent Classification (IPC). VL - no. 409(E) ER -