ARTISTE and ONCOR Digital Linear Accelerators configured with the 160 leaf Multi-Leaf Collimator (MLC) and MEVATRON and PRIMUS Digital Linear Accelerators configured with the High Performance Defining Collimator (HPD); Product is manufactured by Kemnath, Germany-Siemens AG OCS and Siemens AG, Erlangen, Germany-Siemens AG OCS and distributed by Siemens Medical Solutions, Oncology Care Systems, Concord, CA; || Intended to deliver x-ray radiation for therapeutic treatment of cancer. || ARTISTE with 160 MLC, Part No.8139789, || ONCOR AG with 160 MLC, Part No.5863472 || ONCOR Impression || Plus with 160 MLC, Part No.5857912, || ONCOR Expression with 160 MLC, Part No.7360204, || ONCOR Expression with 160 MLC, Part No.7360717, || PRIMUS HI with HPD, Part No. 4504200, || MEVATRON M2 / PRIMUS Mid-Energy / HPD, Part No.1940035, || MEVATRON 6323-2 / HPD, Part No.19244500, || MEVATRON K2 / HPD, Part No.1940753, || MEVATRON PRIMART / HPD, Part No.5500371, || MEVATRON 77 / HPD, Part No.5659503, || MEVATRON M 7400 / 7440 (MEX) / HPD, Part No.5672977, || MEVATRON M 6700 (MX) / HPD, Part No.5693908, || MEVATRON M 6730 / HPD, Part No.5694005, || MEVATRON M 7140 / HPD, Part No.5694104, || MEVATRON M 7400 / HPD, Part No.5694153, || MEVATRON M 7445 / HPD (MEX), Part No.5694203, || MEVATRON K 7467 / HPD, Part No.5694252, || MEVATRON K 7767 / HPD, Part No.5694302, || MEVATRON K 8067 / HPD, Part No.5694401, || MEVATRON M 6300 (MX) / HPD, Part No.8317000, || MEVATRON M 6730/6740 (MEX) / HPD, Part No.8319758, || MEVATRON MD (MD, MDX) / HPD, Part No.8319808, || MEVATRON KD / HPD, Part No.8319857, || MEVATRON MDX / HPD, Part No.8496200, || MEVATRON KD-2 / HPD, Part No.8515520, || MEVATRON M3 6300 / HPD, Part No.9401316, || MEVATRON M2 6700 / HPD, Part No.9401407, || MEVATRON M2 6740 / HPD, Part No.9401506, || MEVATRON KDS / HPD, Part No.941522, || MEVATRON MD-2 / HPD, Part No.9401654, || MEVATRON MDX 2 / HPD, Part No.9401746, || MEVATRON KDS-2 / HPD, Part No.9411588, || MEVATRON KD-2 / HPD, Part No.9822685, || MEVATRON KDS-2 / HPD, Part No.9822693