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

Richard J. Schwarzbach

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A.C. powered detecting device with battery backup

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

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Appliance control system

Communications: electrical – Systems – Selsyn type
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Self-contained fire detector with interconnection circuitry

Communications: electrical – Systems – Call station
Patent

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Warning device

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

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Profile ID: LFUS-PAI-P-796174

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