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

Gerald D. Rork

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Alarm device including a self-test reminder circuit

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

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Ionization chamber for smoke detector and the like

Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
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Smoke detector including an indicator for indicating a missing p

Communications: electrical – Condition responsive indicating system – Specific condition
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Smoke detector with test apparatus

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
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Profile ID: LFUS-PAI-P-795150

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