Gamma radiation detectors; Non-destructive testing x-ray apparatus not for medical purposes; Radiation detectors; radiation-measuring instruments; Radiological apparatus for industrial purposes, namely, radioactivity detector, radio receiver; Optical crystals for use with insert purpose, namely, optical lenses; Optical inspection apparatus; Optical inspection apparatus and their parts and fittings; Optical lenses for optical machines and apparatus made of fluoride crystals, namely, calcium fluoride, barium fluoride, magnesium fluoride