74015236
Dec 29, 1989
Dec 18, 1990
filters, filter housings, filter holders, membranes, filter cartridges, filter discs and parts therefor all employed in the filtering of [ portable ] *potable* liquids and by electrokinetic capture and absorption and by mechanical sieving of contaminates from [ portable ] *potable* liquids being filtered all for use in laboratories
Electrical and Scientific Apparatus