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

Rene Lange

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Infrared intrusion detector with a multi-layer mirror

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent

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IR intrusion detector using scattering to prevent false alarms

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

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Security system and danger sensor for monitoring danger...

Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate

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Security system and danger sensor for monitoring danger...

Communications: electrical – Condition responsive indicating system
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1384379

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