4. Electricity: circuit makers and breakers
  5. Liquid contact
  6. Time delay

John F. Perkins

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Dual compression puffer interrupter

Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent

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Dual-compression gas-blast puffer-type interrupting device

Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent

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Vacuum circuit interrupter with insulated vacuum monitor resisto

Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent

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Vacuum detector

Electricity: measuring and testing – Using ionization effects – For monitoring pressure
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Profile ID: LFUS-PAI-P-61970

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