| 摘要 |
Gas bulbs for soda siphons, etc, are perforated and then pressed against a seal in order to withdraw the gas. In order to permit withdrawal of the gas without losses of gas when the bulbs are perforated, a perforating pin is provided according to the invention which, as a result of its convexly shaped point, prevents blowing-out of the gas before the bulb closure rests against it seal.
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