US PATENT SUBCLASS 73 / 31.02
.~.~ Impurity

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

23.2  DF  GAS ANALYSIS {15}
31.01  DF  .~ Ambient air {1}
31.02.~.~ Impurity

DEFINITION

Classification: 73/31.02

Impurity:

(under subclass 31.01) Subject matter wherein the mixture is being tested for undesirable content.