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

Roy A. Schofield

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Intruder detection apparatus for functioning free of disturbance

Communications: electrical – Condition responsive indicating system – Specific condition
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Intruder detector

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
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Profile ID: LFUS-PAI-P-1890431

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