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Page 372

| Figure A-2 A variety of typical polymer insulator shapes. (Courtesy Hubbell Power Systems) |

| contamination from entering between the petticoats and fiberglass; Figure A-3. The metal fittings at either end are crimped directly to the fiberglass, developing a high percentage of the inherent strength of the fiberglass. It should be noted that fiberglass with an elastometric (plastic) covering has been used for insulation purposes since the early 1920's. |

| The polymer petticoats serve the same function as the petticoats asso- |

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