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Radius dimension with MR in front.....what does it mean?

Question asked by Christopher Estelow on Apr 5, 2017
Latest reply on May 11, 2017 by Christopher Estelow

I came across this on an old Pratt & Whitney drawing this morning and never saw it before.  It is a radius dimension with MR in front of it (see pic below).  Does anyone know what it stands for?  Does it stand for minimum radius?  Any help would be greatly appreciated.