Description: 429 chemistry: electrical current producing apparatus, product, and process / 429 chemistry: electrical current producing apparatus, product, and process/(122) current producing cell, elements, subcombinations and compositions for use therewith and adjuncts (129) separator, retainer or spacer insulating structure (other than a single porous flat sheet, or either an impregnated or coated sheet not having distinct layers) (130) insulator structure is only spacer of the rod, button, strip, or frame type
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