73821879
Aug 28, 1989
Dec 18, 1990
APPARATUS FOR NITRIFICATION, DENITRIFICATION AND/OR PHOSPHATE-ELIMINATION OF SEWAGE WATER, AND CLEARING BASINS THEREFOR; PACKED BEDS FOR WATER PURIFICATION, TOWER PACKINGS FOR AIR AND GAS PURIFICATION, SPRAYING NOZZLES, BIOLOGICAL FILTERS AND REACTORS FOR GAS AND AIR PURIFICATION, GAS SCRUBBERS, AIRSCOOPS, AERATION DISKS, AERATION TANKS, AERATION PIPES, IMMERSION PERCOLATING FILTER FOR WATER PURIFICATION, MIST COLLECTORS, FILLER AND SPACING MATERIALS FOR DISTRIBUTION OF GASES AND LIQUIDS, BEDS SHAPED AS SCREENS OR GRATES FOR WATER AND GAS PURIFICATION, WATER TRAPS, AGITATORS FOR CIRCULATING AIR, GASES OR LIQUIDS
Environmental Control ApparatusENGINEERING SERVICES AND TECHNICAL CONSULTING SERVICES IN THE FIELD OF GAS AND WATER PURIFICATION
Computer and Scientific