4. Electricity: electrical systems and devices
  5. Safety and protection of systems and devices
  6. Transformer protection

Schweitzer Engineering Labs., Inc.

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System for obtaining phase-ground voltages from a broken...

Electric power conversion systems – Phase conversion without intermediate conversion to d.c. – By induction-type converter
Reexamination Certificate

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System for power transformer differential protection

Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Reexamination Certificate

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