4. Optics: measuring and testing
  5. Refraction testing
  6. Prism engaging specimen

Shigeru Kajii

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Photoelectric smoke detector with means for adjusting the amount

Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent

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Smoke detector with changeable pulse light emitting interval for

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Storage type smoke detector

Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent

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Profile ID: LFUS-PAI-P-889123

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