| 摘要 |
Object-support column includes an end unit, a guide tube which has a nominal diameter, and end having an end diameter which is smaller than the nominal diameter, and a transition-length portion extending from the nominal diameter to the end diameter, the end being connected to the end unit. A pneumatic tube surrounds the guide tube and the end unit, the pneumatic tube having a conical section with a diameter reduction surrounding the end unit. Alternatively, a guide portion of the guide tube may be supported radially on the inner wall of the pneumatic tube.
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