4. Communications: electrical
  5. Condition responsive indicating system
  6. With particular system function

American District Telegraph Co.

Corporate Assignee

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Optical smoke detector

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

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Smoke detector with remote alarm indication

Communications: electrical – Condition responsive indicating system – With particular system function
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System for test sequence annunciation

Communications: electrical – Condition responsive indicating system – With particular system function
Patent

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