| 73 / | HD | MEASURING AND TESTING |
| 53.01 | DF | LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID {15} |
| 54.01 | DF | .~ Viscosity {11} |
| 54.11 | ![]() | .~.~ Orifice, nozzle, or extrusion means {3} |
| 54.12 | DF | .~.~.~> Plural fluids (e.g., comparison) |
| 54.13 | DF | .~.~.~> By time interval of travel or flow rate measuring |
| 54.14 | DF | .~.~.~> By force, pressure, or displacement measuring |