BLAK-RAY

FLUORESCENT CHEMICAL ADDITIVES USED FOR STRUCTURAL AND CHEMICAL INSPECTION AND ANALYSIS

FLUORESCENCE ANALYSIS AND INSPECTION APPARATUS; NAMELY, METERS FOR MEASURING ULTRAVIOLET INTENSITY, COMPARISON APPARATUS FOR MEASURING THE ACCURACY OF SUCH ULTRAVIOLET METERS, TRANSILLUMINATORS FOR VIEWING PARTS AND MATERIALS SUBJECTED TO ULTRAVIOLET, AND GOGGLES FOR FILTERING ULTRAVIOLET