The Caterpillar E120 hydraulic excavator was introduced in 1987. It was manufactured in Japan only. The E120 was manufactured in Japan, with a 1LF or 1MF serial number prefix. Production of 1MF ended in 1988; 1LF ended in 1989. ( www.richiewiki.com ) Does anyone know the difference between these machine's that resulted in the two serial number designations? Thanks. -Van
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