China, the leading producer of rare minerals, has made it harder in recent weeks for foreign companies, particularly chip makers, to buy such materials in China (Keith Bradsher/New York Times)

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Keith Bradsher / New York Times:
China, the leading producer of rare minerals, has made it harder in recent weeks for foreign companies, particularly chip makers, to buy such materials in China  —  Already the dominant producer of rare minerals, Beijing is using export restrictions and its power over state-owned companies to further control access.

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