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By certification 
Core Casing of Metal-Oxide Surge Arrester:
It's constituted of below three parts:
1.Metal Oxide Varistors assembled in the middle part
2.Fiberglass Tape wrapped round the surface
3.Aluminum Electrodes fixed on both ends
It's constituted of below three parts:
1.Metal Oxide Varistors assembled in the middle part
2.Fiberglass Tape wrapped round the surface
3.Aluminum Electrodes fixed on both ends
