| http://www.w3.org/ns/prov#value | - nnecting the device for creating a vacuum to the airtight gap for applying suction to at least the annular peripheral portion of the medium being constituted by at least one blind groove formed in the stage and including a seat for receiving an airtight closure strip (for this suction groove) provided with a suction orifice for coupling to the above-mentioned device for creating a vacuum.
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