Dec. 31 (Bloomberg) -- South Korean robotics company Rainbow Robotics said in a regulatory filing Tuesday that Samsung Electronics has become the company's largest shareholder. The document shows that Samsung spent 267 billion won (note: currently about 1.322 billion yuan) to buy a large number of shares in Rainbow Robotics. Previously, Samsung Electronics was already Rainbow Robotics' second-largest shareholder, holding 14.71% of the company's shares, or about 2.85 million shares. And in this ...