4. Communications: electrical
  5. Systems
  6. Call station

William F. Doherty

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Detector system

Communications: electrical – Systems – Call station
Patent

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Smoke detector

Communications: electrical – Condition responsive indicating system – Specific condition
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Smoke detector with test means for simulating a predetermined co

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
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Profile ID: LFUS-PAI-P-350860

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