| http://www.w3.org/ns/prov#value | - Such known liquid treating units are divided into five general types according to the shape of the semipermeable membrane used: the tubular type (U.S. Pat. No. 3,616,929, No. 3,769,128 and No. 3,873,665), the hollow fiber type (U.S. Pat. No. 3,442,002, No. 3,339,341 and No. 3,246,764), the plate-and-frame type (Japanese Patent Application Disclosure No. 70280/1975), the spiral type (U.S. Pat. No.
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