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Based on a statement from a reliable source such as the New York Times, the Wall Street Journal, the BBC, etc.
From the WSJ: There have been some apparent breakthroughs. Last year, Huawei Technologies released its new Mate 60 smartphone, which contained a system-on-chip made with SMIC’s technology comparable with the 7-nanometer process, according to a teardown by TechInsights, an industry research firm.
Neither Huawei nor SMIC have confirmed who manufactured the advanced chip in the Mate 60.
It was seen as a feat because SMIC and other Chinese chip makers don’t have access to the latest lithography machine made by Netherlands-based ASML Holding. The Netherlands restricts such sales to China.
https://www.wsj.com/tech/chinese-semiconductor-industry-smic-self-sufficient-5210abf8