| 356 / | HD | OPTICS: MEASURING AND TESTING |
| 928 | | INVESTIGATING OR ANALYZING MATERIALS BY THE USE OF OPTICAL MEANS, I.E., USING INFRA-RED, VISIBLE, OR ULTRA-VIOLET LIGHT (GO1N 21/00) {5} |
| 929 | DD | .~> Arrangements, or apparatus for facilitating the optical investigation (GO1N 21/01) {1} |
| 931 | DD | .~> Systems in which incident light is modified in accordance with the properties of material investigated (GO1N 21/17) {8} |
| 948 | DD | .~> Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light (GO1N 21/62) {1} |
| 953 | DD | .~> Probe photometers (GO1N 21/85B) |
| 954 | DD | .~> Scan or image signal processing arrangements specially adapted for investigating the presence of flaws or contaminates, e.g., for scan signal adjustments, for detecting different kinds of defects, for compensating for structures (GO1N 21/88) |