| http://www.w3.org/ns/prov#value | - 1 and showing the valve means for reversing the pressure flow of cleaning liquid; FIG. 3 is a view mostly in vertical section on an enlarged scale showing in detail the construction of the pump and the circulation of the cleansing liquid in one direction, and FIG. 4 is a horizontal section taken on the line 4-4 of FIG. 3.
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