Sources: China's export curbs on critical metals have disrupted supplies of micro drill bits made mainly from tungsten carbide, used in PCBs and chip substrates (Cheng Ting-Fang/Nikkei Asia)

Cheng Ting-Fang / Nikkei Asia: Sources: China's export curbs on critical metals have disrupted supplies of micro drill bits made mainly from tungsten carbide, used in PCBs and chip substrates — TAIPEI — China's export controls on critical metals have disrupted supplies of micro drill bits…