| 摘要 |
<p>A performance line display unit includes an imaging device (30) which is attached near a leading end of an extensible boom (16) provided on a rotation platform (14) rotatably placed on a vehicle of a crane (10), a display configured to display an image imaged by the imaging device, and a performance line arithmetic part configured to obtain a performance line regarding a suspended load maximum performance of a crane, wherein the performance line arithmetic part is configured to overlap the performance line with a position of the image corresponding to the obtained performance line to be displayed on the display.</p> |
