| 210 / | HD | LIQUID PURIFICATION OR SEPARATION |
| 348 | DF | FILTER {25} |
| 473 | DF | .~ Resting on supporting receiver, e.g., portable {3} |
| 477 | ![]() | .~.~ Resting on internal stop or surface {3} |
| 478 | DF | .~.~.~> Unitary filter medium and radially expandable retainer |
| 479 | DF | .~.~.~> Inner separate retainer {1} |
| 481 | DF | .~.~.~> Longitudinal retainer or guide, (e.g., reflex coffee maker) |