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