Jisho

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Wikipedia definition
1. Ma JunMa Jun, style name Deheng (徳衡), was a Chinese mechanical engineer and government official during the Three Kingdoms era of China. His most notable invention was that of the South Pointing Chariot, a directional compass vehicle which actually had no magnetic function, but was operated by use of differential gears (which applies equal amount of torque to driving wheels rotating at different speeds).
Read “Ma Jun” on English Wikipedia
Read “馬鈞” on Japanese Wikipedia
Read “Ma Jun” on DBpedia

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