73 / | HD | MEASURING AND TESTING |
861 | DF | VOLUME OR RATE OF FLOW {23} |
204.11 | DF | .~ Thermal type {9} |
204.23 | DF | .~.~ Having particular electrical heating, cooling, or thermal sensing element {2} |
204.25 | DF | .~.~.~ Resistive element {2} |
204.26 | .~.~.~.~ With substrate carrier (e.g., thin film) |