Optical Spectrograph
| and
Infra-Red Imaging System
| optical spectrograph | |
| tech. | оптический спектрограф |
| and | |
| gen. | и; а |
| |||
| оптический спектрограф | |||
|
Optical Spectrograph : 4 phrases in 3 subjects |
| Aerohydrodynamics | 2 |
| Astronautics | 1 |
| Makarov | 1 |