This soft-serve chain opened in 1940 & got the shakes 9 years later
1 Early .... Kroc's first McDonald's restaurant opened on April 15, 1955, at 
400 North Lee ... A year later, the company sold its millionth hamburger and 
introduced ... By 1976, McDonald's had served 20 billion hamburgers, and 
system wide... [DOC] [TLE] 20 Things You Didn't Know About Dairy Queen | Mental Floss [PAR] Mar 23, 2016 ...