The Cohong, sometimes spelled kehang or gonghang, was a guild of Chinese merchants or hongs who operated the import-export monopoly in Canton (now Guangzhou) during the Qing dynasty (1644{–}1911). During the century prior to the First Opium War of 1839, trade relations between China and Europe were exclusively conducted via the Cohong, which was...
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http://en.wikipedia.org/wiki/Cohong
the guild of Chinese merchants authorized by the central government to trade with Western merchants at Canton prior to the first Opium War (1839–42). ... [2 related articles]
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http://www.britannica.com/eb/a-z/c/106
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