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