71528266
Jul 10, 1947
Mar 15, 1949
FILTERS EMPLOYING A FILTERMASS OF COTTON OR OTHER FIBROUS MATERIAL, DIATOMACEOUS EARTH OR THE LIKE-NAMELY, LIQUID FILTERS, AIR AND GAS FILTERS, AND SLURRY FILTERS; SURFACE, DOUBLE-PIPE, AND MULTI-PIPE BEER COOLERS EMPLOYING LIQUID COOLANTS,
Natural Agricultural Products