| http://www.w3.org/ns/prov#value | - Although it is possible to use a thick perforated grid to form both the means for guiding the probes and the means for positioning them, it is particularly advantageous to use, for the second positioning means, a thin perforated grid whose holes have parallel axes and such that the conical projection of the guide holes of the guide means into the plane of the thin grid corresponds to the position
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