did-you-kno:SourceYes, emperor’s counselor Geliang Zhu (AD 181-234) used it. 
did-you-kno: Source Yes, emperor’s counselor Geliang Zhu (AD 181-234) used it. -- source link
did-you-kno: Source Yes, emperor’s counselor Geliang Zhu (AD 181-234) used it. -- source link