| 摘要 |
The apparatus consists of a system of impact needles, which are provided at one end with a cylindrical shoulder of magnetic material for attachment to an electromagnetic plate of the impression machine, for example press machine. The guide body serves for the first introduction of the needles into the mould, which is individually carried out by hand. In the further production of vent holes of the moulds of the same series, the penetration by all the needles is effected in one go by means of the electromagnetic plate.
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