Larry and George continued to build trampolines and founded the Griswold-Nissen Trampoline & Tumbling Company in 1942. In Cedar Rapids, Iowa, the firm manufactured trampolines. The two envisioned new sports arising from novel applications of their innovative instruments. China has made a concerted effort to create world-class trampoline gymnasts since trampolining became an Olympic sport. Their first significant triumph came in the 2007 Men's World Championship, followed by gold medals for both men and women, as well as a bronze medal, in the 2008 Olympic Games in Beijing.