75895993
Jan 12, 2000
WASTE WATER PURIFICATION AND SEWAGE DISPOSAL PLANTS; WATER TREATMENT UNITS, NAMELY, FILTERS, REACTORS, DIGESTERS, DISINFECTORS, SEDIMENTORS, GASIFICATION UNITS AND NITRIFICATION REACTORS
Environmental Control ApparatusDESIGN AND ENGINEERING OF WASTE WATER PURIFICATION AND SEWAGE DISPOSAL PLANTS AND PARTS OF THE AFOREMENTIONED PLANTS, NAMELY NITRIFICATION UNITS
Computer and Scientific