Tʻŭkhŏchʻŏng 20-yŏnsa / [pʻyŏnchʻanja Tʻŭkhŏchʻŏng 20-yŏnsa Palgan Wiwŏnhoe]
特許廳 20年史 / [編纂者특허청20년사발간위원회]

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