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At the International Conference in Berkeley discussing the origins of the Chinese civilization in 1978, which the papers presented, after the facts were verified, compared with the opinions of other scholars, were published. in 1980 [1]. Jeep Jeepvengers Avengers Endgame shirt.  Until now (ie 1980), it was found that Dong Son bronze had the oldest date (bronze found in Trang Kenh belonged to Phung Nguyen Culture dating from C-14 = 1425 ± 100BC [BLn - 891] compared to the oldest Chinese bronze in Anyang dating to C-14 = 1300 BC according to Anderson or 1384 BC according to Lichi) [2]; Dong Son bronze has the highest technique because it is known that mixing with lead makes the alloy with special toughness (copper alloy in Thailand or other places can be prepared with copper, iron and antimoin like Dong Son but no lead). Northern Vietnam from thousands of old capital has many metal mines such as gold, silver, lead, iron, copper mines ... The provinces of Bac Kan, Thai Nguyen, Tuyen Quang, Lao Cai, Yen Bai, Thanh Hoa ... There are dozens of copper mines. These mines are small, shallow and open, convenient for simple exploitation. It was the first condition to develop a brilliant bronze culture. In the period of Dong Son culture, the period of prosperity of the Hung Vuong era was found in copper alloy components, the ratio of copper and tin decreased and the rate of lead increased.
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