United Technologies Corp. said the U.S. Securities and Exchange Commission had launched an investigation regarding sales of the company's jet engines in China by a non-employee sales representative. United Tech, which also makes elevators and climate control systems, said the regulator issued a subpoena seeking documents related to disclosures of sales of its Pratt & Whitney engines and International Aero Engines. The SEC probe follows United Tech's internal investigation into the matter, the company said in a regulatory filing. (Reuters)