4. High-voltage switches with arc preventing or extinguishing devic
  5. Arc preventing or extinguishing devices
  6. Polyphase

Steven Z. Chen

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Electrical switching apparatus, and stored energy assembly...

Electricity: circuit makers and breakers – Contact moved by sudden release of stored energy
Reexamination Certificate

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Encapsulated pole unit conductor assembly for an...

High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Polyphase
Reexamination Certificate

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