4. Electricity: measuring and testing
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Watt meter providing electrical signal proportional to power

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent

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Watt-hour counter

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Fluid
Patent

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Watt-hour meter

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent

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Watt-hour meter cover with battery hatch reset switch and optica

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Casings
Patent

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Watt-hour meter cover with battery hatch/reset switch and optica

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Casings
Patent

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Watt-hour meter with communication on diagnostic error detection

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent

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Watt-hour meter with digital per-phase power factor...

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Reexamination Certificate

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Watt/watt hour transducer having current signals and a modulator

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent

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Watt/watthour transducer and amplifier-filter therefor

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent

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Watt/watthour transducer and integrator and current sources ther

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
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Watthour meter and battery retaining apparatus therefor

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Casings
Patent

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Watthour meter and optical pickup test device and method

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Reexamination Certificate

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Watthour meter comprising a Hall sensor and a voltage-frequency

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent

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Watthour meter for wye connected systems

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent

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Watthour meter open potential circuit detecting device

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent

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Watthour meter or wattmeter comprising hall sensors

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent

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Watthour meter system

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent

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Watthour meter with isolation transformers having a feedback loo

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
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Watthour meter with temperature compensation for wye connected s

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
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Watthour test circuitry

Electricity: measuring and testing – Testing and calibrating electric meters
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