computers; software, planning software and computer programs for medical purposes, namely, for neurosurgical, orthopedic, radiotherapeutic and/or radiosurgical purposes, for application in ear, nose and throat (ENT) surgery, and for application to three-dimensional registration or reference patient data by producing light markings; data carriers including software, planning software and computer programs for medical purposes, namely, for neurosurgical, orthopedic, radiotherapeutic and/or radi...