| 429 / | HD | CHEMISTRY: ELECTRICAL CURRENT PRODUCING APPARATUS, PRODUCT, AND PROCESS |
| 122 | DF | CURRENT PRODUCING CELL, ELEMENTS, SUBCOMBINATIONS AND COMPOSITIONS FOR USE THEREWITH AND ADJUNCTS {16} |
| 129 | DF | .~ Separator, retainer or spacer insulating structure (other than a single porous flat sheet, or either an impregnated or coated sheet not having distinct layers) {4} |
| 142 | | .~.~ Having plural distinct components {2} |
| 143 | DF | .~.~.~> Ribs or projections attached to sheet material |
| 144 | DF | .~.~.~> Plural layers {1} |