| http://www.w3.org/ns/prov#value | - from said storage chamber to said mixing chamber, means for admixing the abrasive material with gas under pressure in the mixing chamber and emitting the admixture therefrom, means for delivering abrasive material into said storage chamber, said delivering means including a conduit having an open end portion in said storage chamber, a restrictor partially received in said open end portion to defin
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