Photosensors, namely, light sensors [ , and replacement parts and structural parts therefor ] ; Detectors, namely, detector machines for use in detecting ion, x-rays, ultraviolet rays, electron radiation, and other atomic and subatomic particles [ , and replacement parts and structural parts therefor ] ; Detection elements, namely, detection elements for use in detecting ion, x-rays, ultraviolet rays, electron radiation, and other atomic and subatomic particles [ , and replacement parts and s...