| 174 / | HD | ELECTRICITY: CONDUCTORS AND INSULATORS |
| 137 R | DF | INSULATORS {17} |
| 176 | DF | .~ With terminal elements {5} |
| 177 | ![]() | .~.~ Plural {5} |
| 178 | DF | .~.~.~> Multi-part, sectional or composite insulator {2} |
| 181 | DF | .~.~.~> With insulated reinforcing or interlocking element |
| 182 | DF | .~.~.~> Cap and pin |
| 183 | DF | .~.~.~> Overlapping {2} |
| 186 | DF | .~.~.~> Caps |