Description of symbols used in Figs 2, 3 and 4 corresponding to the technology sectors and fields given in the IPC-Technology Concordance Table (WIPO, 2012).
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Description of symbols used in Figs 2, 3 and 4 corresponding to the technology sectors and fields given in the IPC-Technology Concordance Table (WIPO, 2012).
创建时间：
2018-02-09
