| http://www.w3.org/ns/prov#value | - The optical block 4, which is compatible with laser, in particular infrared laser, sources and is integrated into the part 3 moving in elevation, may comprise mirrors, but advantageously consists, in this example, of a biprism 4 fastened via its bases between two supports 9 and 10 mounted so as to swivel, between the two arms 11 and 12 of the fork 2, about the elevation axis XX, which is perpendic
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