73699707
Dec 4, 1987
Feb 28, 1989
DEPTH FILTER ELEMENTS OF ORGANIC AND/OR INORGANIC FIBERS AND POWDERS; COMPOSITE FILTERS COMPRISING A COMBINATION OF THE AFOREMENTIONED DEPTH FILTER ELEMENTS WITH FILTER MEMBRANES; CLOSED FILTER SYSTEMS WITH DEPTH FILTER ELEMENTS OR COMPOSITE FILTERS OF THE AFOREMENTIONED TYPE; ALL OF THE AFOREMENTIONED GOODS FOR THE FILTRATION OF LIQUIDS OR GASES
Environmental Control Apparatus