Jade cong tube with patterns added in the Qing dynamic, Longshan Qijia system (2200-1700 BCE), Stationery and stationery. From the late Ming Dynasty to the early Qing Dynasty, antique patterns were carved on the surface of vessels
![新石器時代晚末期 龍山-齊家系 玉琮](https://chinaarchive.net/Neolithic Period/Jades/C1C000443N000000000PAC-176.jpg)
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