Similar scenarios played out at other fast - food hamburger concepts. (fesmag.com)
Shake Shack, Inc. operates fast food hamburger restaurants. (borntosell.com)
«Fast - food hamburger restaurants in the»50s,»60s and»70s were constrained to the United States, but in the»80s and»90s, the traditional fast - food restaurants became worldwide,» King explains. (fooddrink-magazine.com)