128 / | HD | SURGERY |
200.24 | DF | RESPIRATORY METHOD OR DEVICE {32} |
205.27 | DF | .~ Means for removing substance from respiratory gas {2} |
205.29 | DF | .~.~ Particulate filtering {2} |
206.12 | DF | .~.~.~ Face mask covering a breathing passage {7} |
206.16 | .~.~.~.~ With frame, shaping means, reinforcement, or filter formed of wire |