| 摘要 |
The holding device for drilling tools (2) consists of a column cross (1), the columns (6, 7) of which are connected to one another in such a way that they can be mutually adjusted. Each column (6, 7) is supported via a vacuum bell jar (9, 14) on the material to be drilled, for example a wall (5), and on a further structural member, for example a floor (3). A joint is provided between at least one column (7) and its suction jar (14), connecting them. <IMAGE>
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