| 96 / | HD | GAS SEPARATION: APPARATUS |
| 15 | DF | ELECTRIC FIELD SEPARATION APPARATUS (E.G., ELECTRICAL PRECIPITATOR, ELECTROSTATIC TYPE, ETC.) {17} |
| 55 | DF | .~ And serially arranged nonelectrical separator {3} |
| 57 | DF | .~.~ Precedent nonelectrical separator {1} |
| 58 | ![]() | .~.~.~ Separator is single porous filter |