| http://www.w3.org/ns/prov#value | - ront of the laser oscillating unitto refract the laser beam at a selected direction, a focusing lens group for focusing the refracted laser beam on the marked cutting line and a focusing lens housing containing the focusing lens group. [0049] In addition, the light detecting part is a light detecting sensor for detecting light amount of the second laser unit reflected by the crack. [0050] Preferab
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