US PATENT SUBCLASS 73 / 23.38
.~.~ Petrochemical

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

23.2  DF  GAS ANALYSIS {15}
23.35  DF  .~ Gas chromatography {7}
23.38.~.~ Petrochemical

DEFINITION

Classification: 73/23.38

Petrochemical:

(under subclass 23.35) Subject matter in which the gas being tested is a derivative of petroleum.