71299689
Apr 30, 1930
Nov 11, 1930
DIATOMACEOUS EARTH, KIESELGUHR, AND INFUSORIAL EARTH IN LUMPS OR PULVERIZED FORM, MORE OR LESS DRIED, USED IN THE PREPARATION OF FILTER AIDS, FILLERS, HEAT INSULATION, CONCRETE ADMIXTURES, ABSORBENTS, AND POLISHES
Chemicals