Cummins diesel generator sets use Cummins engines. Cummins was established in 1919 and has its headquarters in Columbus, Indiana, USA. Cummins has more than 680 distributors in 137 countries and regions worldwide, and more than 5,000 service points are distributed all over the world. As the largest foreign investor in the Chinese engine industry, Cummins has manufacturing enterprises such as Chongqing Cummins Engine Co., Ltd. (producing M, N, and K series diesel engines) and Dongfeng Cummins Engine Co., Ltd. (producing B, C, and L series diesel engines) in China, and produces with Cummins' global unified quality standards. The service network of Cummins throughout the country provides the fastest service guarantee for users.