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Mean Machine is the second studio album by German heavy metal band U.D.O. It was released in 1989 via RCA Records. After their previous album, Animal House, Peter Szigeti had been replaced by Andy Susemihl from Sinner, Frank Rittel by Thomas Smuszynski (who later went on to Running Wild) and Thomas Franke by Stefan Schwarzmann. Dieter Rubach, who joined the band after the recording of Animal House left and was replaced by Smuszynski.