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In the early 1950s, the [[Midwest Research Institute]] in [[Kansas City, Missouri]], working for M&M's, perfected a process whereby {{convert|3300|lb}} of chocolate centers could be coated every hour.<ref>{{cite web|url=http://www.mriresearch.org/AboutMRI/Breakthroughs.asp |title=MRI Breakthroughs |publisher=Mriresearch.org |date=2001-09-11 |accessdate=2010-01-15}}</ref>
Peanut M & Ms were introduced in 1955, but were never made in the tan color.
In 1960 Peanut M & Ms added the yellow, red, and green colors.
===1970s and 1980s===
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