Serial Number  MRA-3R2015 the serial number would read MRA is model  3 third quarter R year(2013) and 2015 is the unit number made. Serial Number  MRA-3S2015 the serial number would read MRA is model  3 third quarter R year(2014) and 2015 is the unit number made. Serial Number  MRA-3T2015 the serial number would read MRA is model  3 third quarter R year(2015) and 2015 is the unit number made. ..
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