An insulator having a central portion or stem and {HEAD ~ one or more sheds} is provided with {TAIL ~ a barrier} over at least one of the sheds whereby a substantial improvement in withstanding flashover is obtained yet significant damage to the surface of the insulator is avoided 
is provided with
An insulator having a central portion or stem and { HEAD ~ one or more sheds } is provided with { TAIL ~ a barrier } over at least one of the sheds whereby a substantial improvement in withstanding flashover is obtained yet significant damage to the surface of the insulator is avoided
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