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