China exported small amounts of two minerals crucial to high-tech manufacturing in October, marking a resumption in sales after a two-month hiatus caused by Beijing’s restrictions.

The controls on germanium, gallium and their chemical compounds, used to make parts for chips, telecommunications equipment and electric vehicles, were imposed on Aug. 1 on national security grounds, as China escalated its tit-for-tat trade war with the US and Europe. Another set of export controls on graphite, a key material for EV batteries, is due to come into force on Dec. 1.