| 摘要 |
A linear drive-shaft sealing apparatus particularly useful in removing crystals from a melt solution of an evacuated chamber, which sealing apparatus comprises a first input drive shaft and a second output drive shaft, both shafts adapted for linear movement, a cylindrical element disposed between the input and output shafts and adapted for rotary movement, a housing surrounding the cylindrical element, and a multistage, magnetic seal apparatus which provides a magnetic seal between the housing and the cylindrical element.
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