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