What does CMRRR mean in USPS?

This page is about the meanings of the acronym/abbreviation/shorthand CMRRR in the Miscellaneous field in general and in the USPS terminology in particular.

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"CMRRR." Abbreviations.com. STANDS4 LLC, 2015. Web. 30 Jun 2015. <http://www.abbreviations.com/term/372038>.