"u20683" . "A rotary compressor intended to use a liquid annulus held by centrifugal force around the inside of a casing by a single rotor-impeller to compress vapour isothermically." . "RDS434654" . . "LIQUID RING COMPRESSOR" . "1999.09.15" . "LIQUID RING COMPRESSOR" . "640200" . "LIQUID RING VACUUM PUMP" . "Recorded" .