72137953
Feb 14, 1962
May 19, 1964
PREPARED AND UNPREPARED POWDERS,FIBERS, AND GRANULAR PARTICLES OF ORGANIC AND INORGANIC ORIGIN AS WELL AS MIXTURES OF ALL SUCH PARTICLES WITH EACH OTHER AND WITH COAL, EARTH, SAND, KIESELGUHR, FELT, VEGETABLE FIBERS, ARTIFICIAL FIBERS, LINEN, PAPER, COTTON FOR FILTERING LIQUID, ALSO FILTERING LAYERS PRODUCED FROM THE ABOVE FILTERING MATERIALS AND THEIR DERIVATIVES
Natural Agricultural Products