I a related story Dave Thomas founder of Wendy's got his square burger idea from a burger place in Knoxville called the Blue Circle. Some accounts say Krystal but it was actually a Blue Circle. Dave worked at what was then the Regas's Restaurant which was at that time the highest class restaurant in Knoxville and was owned by the Regas Brothers.
That is where Dave learned much of his stuff. He learned the resturant business from them and applied it to the Blue Circle/Krystal concept of fast food. He would stop in the Blue Circle either before or after work. Blue Circle was gone by the early 1970's and was strictly a local company. They were much better than Krystals actually until the owners sold out a few years before they closed down.
Yikes I left out Harlan Sanders trained him also.