The memory chipmakers began testing AMEC etching equipment about two years ago, when uncertainty was mounting over whether Washington would continue allowing them to import U.S. chipmaking tools into China, two of the sources said.

The memory chipmakers began testing AMEC etching equipment about two years ago, when uncertainty was mounting over whether Washington would continue allowing them to import U.S.…

Samsung Electronics and SK Hynix are evaluating chipmaking equipment from China’s Advanced Micro-Fabrication Equipment Inc. (AMEC) for possible use at