| 摘要 |
<p>A combined set of a control display and an alarm signal generator, said control display comprising at least one indicator provided for indicating an operational status of a tool, said alarm signal generator being provided for generating an alarm signal upon establishing that said operational status has reached a predetermined critical stage, said alarm signal generator comprises at least one sensor applied on said indicator in such a manner as to detect that said indicator indicates that said critical stage has been reached.</p> |
