High Voltage Switching and Protective Equipment, Consisting of Indoor and Outdoor Apparatus for High-Tension Electrical Installations; Outdoor and Indoor Substations and Parts Thereof, Bus-Bar Supports and Parts Thereof, Switches, Pole-Top Switches, Fuses, Chemical Fuses, Fuse Mountings, Wiring Supports, Insulators, Choke Coils, Entrance Tubes, Arresters, Fuse Tongs, and Plugs