| 摘要 |
The electrical heater (1) has a tubular thermally conducting envelope (2) which contains a resistive heating element (3) supplied by electrical conductors (5,6) and insulated by powdered magnesium oxide (4). Heating and switching compartments (2a,2b) are separated by a thermally insulating wall (7) and the switch is provided with a conducting shoe (11) and a layer (15) thermally conducting but electrically insulating
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