4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Optical or pre-photocell system

John A. Forss

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Electro-optic smoke detector

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

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Exhaust air system for electrostatic air cleaner

Gas separation – Means within gas stream for conducting concentrate to collector
Patent

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Self-checking photoelectric smoke detector

Communications: electrical – Condition responsive indicating system – Specific condition
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Profile ID: LFUS-PAI-P-466668

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