US PATENT SUBCLASS 210 / 352
.~.~ Internal spring

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

348  DF  FILTER {25}
350  DF  .~ With movable means to compress medium {2}
352.~.~ Internal spring

DEFINITION

Classification: 210/352

(under subclass 350) Apparatus wherein the means to compress comprises a spring encased by the receptacle.