1955, what period of cultural relics were unearthed in the ancient tombs of Yunnan culture discovered in Jinning County, Kunming City, Yunnan Province?

Yunnan province has been the residence of ethnic minorities since ancient times, just like the Warring States and the Western Han Dynasty, that is, Yunnan. Therefore, Dian nationality or Dian culture occupies a certain position in ancient culture. As early as 1955, the ancient tombs of Yunnan people's culture were discovered in Jinning County near Kunming City, Yunnan Province, and many bronze castings equivalent to the cultural relics of the Warring States Period or the Western Han Dynasty were unearthed, among which there were many high-quality products with regional and national characteristics.