| http://www.w3.org/ns/prov#value | - That is, as shown in the sectional structure of FIG. 41, on a hollow, cylindrical core metal 132 formed of metal such as aluminum, copper and iron having good thermal conductive characteristics, heat-resistant synthetic resin such as phenol, and material such as ceramic, an elastic layer 133 serving dually as an electrical insulating layer, formed of heat-resistant elastic rubber such as silicone
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