4. Optics: measuring and testing
  5. By particle light scattering
  6. With photocell detection

Erwin Tresch

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Smoke detector

Optics: measuring and testing – By particle light scattering – With photocell detection
Patent

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Smoke detector

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Smoke detector

Optics: measuring and testing – By particle light scattering – With photocell detection
Patent

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Smoke detector with a conical ring-shaped radiation region

Optics: measuring and testing – By particle light scattering – With photocell detection
Patent

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Smoke detector with bimetallic element for temperature compensat

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