US PATENT SUBCLASS 73 / 863.25
.~.~.~ Changing feature

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

863  DF  SAMPLER, SAMPLE HANDLING, ETC. {11}
863.21  DF  .~ With constituent separation {2}
863.23  DF  .~.~ Sieve, filter, or semipermeable membrane {2}
863.25.~.~.~ Changing feature

DEFINITION

Classification: 73/863.25

Changing feature:

(under subclass 863.23) Subject matter having means to facilitate replacement of the barrier.