4. Electricity: electrical systems and devices
  5. Safety and protection of systems and devices
  6. Reverse phase responsive
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Phase sequence correcting system for three-phase AC power

Electricity: electrical systems and devices – Safety and protection of systems and devices – Reverse phase responsive
Patent

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Phase unbalance detector

Electricity: electrical systems and devices – Safety and protection of systems and devices – Reverse phase responsive
Patent

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Polarity guard circuit

Electricity: electrical systems and devices – Safety and protection of systems and devices – Reverse phase responsive
Patent

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Protection of appliances against reversal of battery polarity

Electricity: electrical systems and devices – Safety and protection of systems and devices – Reverse phase responsive
Patent

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Protective apparatus

Electricity: electrical systems and devices – Safety and protection of systems and devices – Reverse phase responsive
Reexamination Certificate

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