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

Ralph A. Giffone

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Electrical interference free projected beam smoke detector

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

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Modular transceiver with adjustable specular member

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

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Self-compensating projected-beam smoke detector

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

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Self-diagnostic projected-beam smoke detector

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

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Profile ID: LFUS-PAI-P-816558

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