73 / | HD | MEASURING AND TESTING |
863 | DF | SAMPLER, SAMPLE HANDLING, ETC. {11} |
863.41 | DF | .~ Flow divider, deflector, or interceptor {4} |
863.51 | DF | .~.~ Having an upstream-facing-opening-type capture element {6} |
863.52 | DF | .~.~.~ With receptacle {1} |
863.53 | .~.~.~.~ Mounted for flow zone traverse |