The images were made-for-TV dramatic: Olympic torch-bearers ran through capital cities, encircled by two columns of Chinese guards and local police while protesters dove into their midst, struggling to wrest away the historic torch. The televised scenes in London and Paris early this month appeared to be a worst-case public relations scenario for China, host of the upcoming Summer Olympics, but for the three international corporate sponsors of the round-the-world Olympic torch relay, there was a small blessing: Amid the images of hand-to-hand street fighting, logos for Coca-Cola, Lenovo and Samsung Electronics were not readily visible. With the Olympics still months away, however, corporate sponsors may not remain so lucky.…