| 摘要 |
The invention relates to a plug pin which receives an LWG coaxially and which consists of a hard basic material having a low coefficient of thermal expansion. An accurate working of the convex surface of the plug pin is possible without any problems in that its outer convex surface is provided on at least a part of its length with a coating, having a thickness of less than 300 mu m, in particular less than 150 mu m, of a material which can be subjected to a chipping treatment better than the basic material.
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