Le Di Laser Technology Co., Ltd. and Linglong Laser Application Technology Research Institute are located in Linyi City, Shandong Province, China. China 9439 Factory, a veteran military enterprise, is a high-tech enterprise specializing in developing and producing laser automatic equipment such as laser marking machine, laser cutting machine, laser engraving machine and optical fiber marking machine. The company integrates R&D, production, sales and service. It owns two brands, Le Di and Linglong, and has a number of technical patents. The sales area covers more than 20 countries and regions at home and abroad.