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Oncology Services International, founded in 1985, has become the leading independent alternative to linac manufacturers post-warranty maintenance service. With coast-to-coast coverage, and the only comprehensive training and testing facility outside of a major manufacturer, OSI has grown to serve more than 200 sites in the United States, and provides Precision Certified refurbished and/or pre owned linear accelerator equipment globally. Additionally, OSI is a leader in used linac parts distribution and repair for used linear accelerators, providing cost effective alternatives for all radiation therapy facilities.