73 / | HD | MEASURING AND TESTING |
53.01 | DF | LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID {15} |
61.41 | DF | .~ Content or effect of a constituent of a liquid mixture {8} |
61.63 | .~.~ Settling or filtering ability {2} | |
61.64 | DF | .~.~.~> By volume or flow rate |
61.65 | DF | .~.~.~> Sedimentation rate {4} |