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

Ray Voorhis

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Condition responsive detection system and method

Communications: electrical – Condition responsive indicating system – Specific condition
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Optical fire or explosion detection system and method

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
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Test device for an optical infra red detector

Radiant energy – Photocells; circuits and apparatus – Flame light source
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Profile ID: LFUS-PAI-P-62583

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