Chang Yŏngsil

Korean inventor (1390–1442)

Chang Yŏngsil (Korean: 장영실; Hanja: 蔣英實; pronounced [t͡ɕɐŋ jʌŋɕiɭ]; ? – after 1442) was a Korean mechanical engineer, scientist, and inventor during the Joseon dynasty. He was born to a mother who was a government-registered courtesan (관기; 官妓) and a father of Yuan dynasty descent.

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