4. Communications: electrical
  5. Condition responsive indicating system
  6. Specific condition

Kurt Hess

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Demultiplexing photodiode sensitive to plural wavelength bands

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent

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Fire detector

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Optical smoke detector with active self-monitoring

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

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Scattered light smoke detector

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

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Scattered light smoke detector

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

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Profile ID: LFUS-PAI-P-1048202

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