Tony Yu watches a worker in a "clean room" at his Gentech offices in the Zinzhuang Industrial Zone in the suburbs of Shanghai, China. Tony Yu grew rich helping build China in to the world's factory floor. Over the past decade his company has outfitted over a thousand assembly lines with equipment, as rapid expansion was the name of the game. Today, however, is a different story. The economic downturn has all but eliminated investment and expansion and Tony Yu's business, Gentech, is suffering. While Gentech rode the wave of expansion and optimism while business was good, it is clearing taking a hit as China's economy proves less invincible that previous thoughts.