KLA-Tencor Corp was formed in April 1997. It is a supplier of process control and yield management solutions for the semiconductor and related nanoelectronics industries. Its products are also used in other high technology industries, including the light emitting diode and data storage industries, as well as general materials research. Its portfolio of defect inspection and metrology products, and related service, software and other offerings, helps integrated circuit manufacturers manage yield throughout the entire semiconductor fabrication process-from research and development to final volume production. Its products and services are used by the bare wafer, IC, lithography reticle and disk manufacturers. The Company's defect inspection and metrology products and related offerings can be broadly categorized into the following groups: Chip Manufacturing, Wafer Manufacturing, Reticle Manufacturing, LED and Compound Semiconductor Manufacturing, Data Storage Media/Head Manufacturing, Microelectromechanical Systems Manufacturing, and General Purpose/Lab Applications. The Company's in-house manufacturing activities consist mainly of assembling and testing components and subassemblies that are acquired through third-party vendors and integrating those subassemblies into its finished products. Its principal manufacturing activities take place in the United States (Milpitas, California), Singapore, Israel, Germany and China. Its competitors include Applied Materials, Inc., ASML Holding N.V., Hermes Microvision, Inc., Hitachi High-Technologies Corporation and Nanometrics, Inc.