| http://www.w3.org/ns/prov#value | - ciated with the treatment unit, the suction unit being activated to generate suction at a suction port; (d) a plurality of suction heads in fluid connection with the suction port and deployed to clamp against the external surface; and (e) a drive mechanism for moving the treatment unit, the drive mechanism including a belt, wherein a plurality of suction heads are deployed in spaced relation along
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