device to cancel the negative pressure in the suction piping of automobile engines.

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  机译： 吸泵和负压保持装置具有抽吸泵，以及用于附接负压保持装置的方法

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  机译： 抽吸泵，具有抽吸泵的负压保持装置以及用于安装负压保持装置的方法

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  机译： 抽吸泵，具有抽吸泵的负压保持装置以及用于安装负压保持装置的方法

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