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Ultra Clean Holdings, Inc., together with its subsidiaries, designs, develops, prototypes, engineers, manufactures, and tests subsystems tailored to specific steps in the semiconductor manufacturing process and manufacturing processes in other industries. It offers precision robotic systems for use when accurate controlled motion is required; robotic surgery products; and gas delivery systems consisting of gas lines, comprised of several filters, mass flow controllers, regulators, pressure transducers and valves, associated interconnect tubing, and an integrated electronic and/or pneumatic control system mounted on a pallet. The company also provides chemical mechanical planarization subsystems; chemical delivery modules, which deliver gases and reactive chemicals from a centralized subsystem to the reaction chamber; and top-plate assemblies that form the top portion of the reaction chamber. In addition, it offers frame assemblies that form the support structure to which other assemblies are attached and include pneumatic harnesses and cables that connect other critical subsystems together; process modules, which are subsystems of semiconductor manufacturing tools that process integrated circuits onto wafers; and other high level assemblies for use in semiconductor manufacturing, research, flat panel, energy, and medical equipment industries. The company sells its products through its direct sales force primarily in North America and Asia. It serves primarily original equipment manufacturers in the semiconductor capital equipment, flat panel, medical, energy, and research industries. Ultra Clean Holding, Inc. was founded in 1991 and is headquartered in Hayward, California.