4. Refrigeration
  5. With indicator or tester
  6. Operatively correlated with automatic control

John C. Harding, Jr.

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Apparatus for determination of probe contact with a liquid surfa

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent

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Capacitor storage circuit

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent

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Contaminant error reduction system for dew point hygrometers

Measuring and testing – Gas content of a liquid or a solid – By vibration
Patent

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Controlled power converter for thermoelectric heat pump drive

Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent

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