| 356 / | HD | OPTICS: MEASURING AND TESTING |
| 918 | | PHOTOGRAMMETRY; PHOTOGRAPHIC SURVEYING (GO1C 11/00) {2} |
| 919 | DD | .~> Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g., controlling overlapping of pictures (GO1C 11/02) {1} |
| 921 | DD | .~> Interpretation of pictures (GO1C 11/04) |