73696273
Nov 19, 1987
Jan 17, 1989
DRUM SCREEN FOR SEPARATING LIQUIDS AND SOLIDS; AND GRAVITY SETTLERS FOR LIQUID/SOLID SEPARATION FOR INDUSTRIAL AND MUNICIPAL USE; SAND FILTERS FOR CONTINUOUS REMOVAL OF SUSPENDED MATTER FROM A LIQUID; WATER TREATMENT SCREENS FOR EQUIPMENT; AND STATIC AERATORS FOR USE IN WATER OXYGENATION
Environmental Control Apparatus