filters for gaseous or liquid materials, particularly for fluids, such as oil, lacquers, cooling water, condensates, beverages and process related fluids; filter inserts, comprised of porous materials either in whole or in part, i.e., paper, cardboard, felt, kieselguhr, ceramic, synthetic materials and natural and synthetic fibers; activated charcoal filters; collectors for impurities, namely abrading or shaving filters, solid-liquid separators, filters for removing dirt from liquids, pre-sep...