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

David F. Farnsworth

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Infrasonic frequency resonant circuit and method for use thereof

Electricity: measuring and testing – Testing potential in specific environment – Voltage probe
Patent

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Method and apparatus for detecting local precursor seismic activ

Communications: electrical – Condition responsive indicating system – Specific condition
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Profile ID: LFUS-PAI-P-927647

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