@article{20926, recid = {20926}, title = {General information on the sixth edition of the International Patent Classification [Text in Chinese].}, pages = {1 volume (various paging) ;}, note = {Contents : Introduction; Structure of the IPC; The IPC Agreement of 1971; IPC publications and machine-readable products; Principles underlying the system; Use of the IPC for classifying the patent documents of various countries; Use of the IPC for the retrieval of patent documents; Assistance in classification of search files according to the IPC; Training in the use of the IPC;.}, url = {http://tind.wipo.int/record/20926}, }