Yes. I used a few of the machines they still use today while I was employed for Burger King (1988–1996). Placing the frozen patties (which is packaged in a box) on a moving chain that feeds the meat slowly through a heated region is the idea behind frying a burger. To get a homogeneous cook, we are need to space the patties out at a specific distance from one another. The cooked burger slips off the chain once the assembly line of patties reaches the end and is either meant to be placed in a steamer (which keeps it warm) or on a burger you're currently preparing. The burger likely tastes more "ready-made" after this process than it would after a McDonald's burger.