| http://www.w3.org/ns/prov#value | - This feature of construction presented, however, certain disadvantages: the operation of the hydraulic cylinder system, responsible for relieving the pack of discs from the compact, filtering position, was mainly dependent upon the level of back-pressure applied by the reverse water flow, dictated, among others, by a relatively large diameter piston; rather cumbersome valve means had to be used fo
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