air vent
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- metacrystalline
- time-averaged shadow-moire method
- optical harmonic generation
- optical head controllers,control ics/modules
- visible emissivity
- chronophotography
- Varotal lens
- diatomic roto
- optical deformation
- infra-red beam folower
- filters
- mode pattern
- intensifying screen
- holographic gratings
- geometrical focus
- push out
- multilongitudianl-mode laser
- upper state relaxation
- frequency summing
- astrospectrograph camera