US PATENT SUBCLASS 73 / 31.03
.~ Impurity

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

23.2  DF  GAS ANALYSIS {15}
31.03.~ Impurity

DEFINITION

Classification: 73/31.03

Impurity:

(under subclass 23.2) Subject matter wherein the gas is being tested for undesirable content.