amazing..when we see these old pieces of goods,actually we can be proud of our ancestors..look at the technology they have used to do this kind of amazing things to last this long..now we say the technology is well developed than in the past...but these are the proofs to show that they have had a wonderful technology with them to create these kind of things..i am so proud about our ancestors..and thanks for sharing this with us :)
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;))
technology develops as a result of accumulations, some times there were some thing we lost in the process of accumulations. Koryeo dynasty is one of the lost technology