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They were named after the company founders Forrest Mars Sr. and R. Bruce Murrie
The M's are the last names of two men. The first man is Forrest E. Mars, Sr., founder of the Mars Company. The other M stands for Murrie, as in Bruce Murrie, son of long-term Hershey president...
It was for the founders, Mars & Murrie.
after the candies cool they are put on a conveyor belt and are stamped by a machine