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

Bernard L. Jansen

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Emergency alarm method and system utilizing cross cueing and ran

Communications: electrical – Condition responsive indicating system – Specified indicator structure
Patent

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Emergency signalling unit and alarm system for rescuing endanger

Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent

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Power loss indicator

Communications: electrical – Systems – Call station
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Telephone privacy device

Patent

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Profile ID: LFUS-PAI-P-224667

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