| http://www.w3.org/ns/prov#value | - The gas delivery means includes a supply for delivering a flow of air or other gas into the hollow interior of the tubular member 62 for discharge from the outlet 68 in a direction toward the viewing zone 69 and at a velocity and volume sufficient to purge spent blast media, normally dispersed in the viewing zone 69, away from at least that portion of the article being cleaned.
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