手柄，手轮，拉手。
机械操作件主要有：手柄、星型把手、手轮，附件有位置显示器、位置指示表等；广泛应用于机床及印刷、纺织、轻工、包装、矿山、食品、医疗器械等各种机械的配套生产。
Our main products include handles, knobs, hand wheels, position indicator and so on. they are widely used in various machinery regions such as machine tool, printer, light industry and so on.
手轮、手柄和扳手传动以及安全阀、减压阀、疏水阀省略本代号。
The engineer opened the safety valve to allow the steam to escape and so reduce the pressure.
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