Hewlett-Packard Co (HPQ.N) will sell a controlling 51 percent stake in its China-based data-networking business to China’s Tsinghua Unigroup for at least $2.3 billion, forming a partnership designed to create a Chinese technology powerhouse. State-backed Tsinghua Holdings’ subsidiary Unisplendour Corp Ltd will acquire 51 percent of HP’s H3C Technologies for at least $2.3 billion, Unisplendour said in a statement to the Shenzhen stock exchange late on Thursday. The U.S.