| 摘要 |
<p>The electric heater (H) has wires (3) in the form of a flexible conductor, where the wires are made of copper, steel or copper alloy. A central element is provided in the center of the heater. Each wire is surrounded by an insulating layer. Units are arranged around the central element. Other wires (6) are made of steel, iron or alloys. The wires are coated with polyurethane.</p> |
