| 摘要 |
A resistance heating apparatus has a resistance wire (28, 38) which can move within a spiral recess (26, 30, 34, 36) in a support body (20) held by a hollow cylindrical body (18) within an insulating pot (12). Preferred Features: The apparatus has two coaxial support bodies (20, 22), each having a spiral recess (26, 30, 34, 36) for a resistance wire winding (28, 38).
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