Arbitrage (Deng) small scale measure the weight valuables or certain drugs. Same principle as the steelyard, units of measurement are two small micrometer. Xiao Ming dynasty Qing dynasty

Arbitrage (Deng) small scale measure the weight valuables or certain drugs. Same principle as the steelyard, units of measurement are two small micrometer. Xiao Ming dynasty Qing dynasty - 54153180

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