4. Electricity: measuring and testing
  5. Fault detecting in electric circuits and of electric components
  6. For fault location

Tomoaki Utsumi

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Gas circuit breaker

High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Patent

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Gas insulated device and failure rating method

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate

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Gas insulated electric apparatus

Electricity: conductors and insulators – With fluids or vacuum – With fluid-condition responsive and/or indicating means
Patent

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Gas insulated switchgear

Electricity: conductors and insulators – With fluids or vacuum – Conduits – cables and conductors
Patent

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Gas insulating apparatus and method for locating fault point...

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate

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Profile ID: LFUS-PAI-P-272361

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