neurosurgical medical equipment and devices; namely, radiation treatment medical apparatus; stereotactic surgical equipment including a coordinate frame and semicircular arc; accessory stereotactic surgical instruments including helicoidal screws, precision twistdrill, biopsy needles and the like; radiofrequency lesion generator; X-ray apparatus; pediatric surgical drills; computer tomography and magnetic resonance adapters; [ ultrasonic aspirators; hand held microsurgical instruments ]