| 摘要 |
A control operator is disclosed which is particularly useful for actuation by advancing work pieces in the interior of a high temperature vacuum furnace, the operator having a portion extending through the furnace wall for actuating an externally disposed control device, such as an electrical circuit control switch or a fluid valve, the operator being replaceable as a unit, having provisions for sealing against pressure or vacuum leakage and for effectively reducing heat conductivity from the interior to the exterior.
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