| http://www.w3.org/ns/prov#value | - o be capable of being displaced in particular along a grid of parallel straight segments to form parallel diffusing grooves; said concentrator also being mounted to move relative to the bench along a third direction that is generally orthogonal to the two first directions, in such a manner as to enable its outlet focal plane to be brought into coincidence with the surface to be machined. 16.
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