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| Continued development of HITS and the “light line” measuring technique - We continued to develop HITS, and by June 1981 a box was added to the HITS trolley with a light array to record the chainage for the profile in the image. -The illuminated scale bars can be clearly seen in this image |
| Image | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
Total images: 10