| 摘要 |
The hardware-screw bradawl according to the invention is designed in such a way that it is not only more versatile in use but is also less expensive to manufacture. Bradawls of this type could hitherto only be used to a limited extent for large and small hardware bores. The bradawl according to the invention can be used for all hardware bores. The bradawl according to the invention can be manipulated just as quickly as the hitherto known bradawls but is about fifty times cheaper.
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