Samsung Electronics Co., the world's largest chipmaker, signaled Friday that it could invest an additional US$3 billion to boost chip production lines at its new plant here, saying it is "open to more investment" in China. Kim Ki-nam, head of Samsung's memory chip business division, made the remarks at a meeting with a group of South Korean correspondents as Samsung began mass producing a faster and higher-capacity version of flash memory chips at its $7 billion plant in Xian