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Thread: Old designations for standards/masters

  1. #1
    Associate Engineer
    Join Date
    Mar 2011

    Confused Old designations for standards/masters

    I've come across some master setting rings all marked with either of the following; AR, MR, or SR. How do these designations compare to today's Class Z, Y, or X?
    Last edited by mpcarrier66; 03-07-2011 at 11:39 AM.

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