US PATENT SUBCLASS 210 / 500.4
.~.~.~.~ Carbonate

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

348  DF  FILTER {25}
500.1  DF  .~ Material {6}
500.21  DF  .~.~ Semipermeable membrane {6}
500.27  DF  .~.~.~ Organic {7}
500.4.~.~.~.~ Carbonate