71305159
Aug 30, 1930
Jan 13, 1931
SILICA GELS, BEING POROUS SILICEOUS MATERIALS FOR THE ABSORPTION OF CHEMICAL PRODUCTS OR DYESTUFFS OR COLOURING MATTERS AND THE LIKE FROM LIQUIDS OR GASES AND FOR THE ABSORPTION AND RECOVERY OF VAPOURS OF ORGANIC COMPOUNDS OR OF WATER FROM GASES
Metal Goods