[crdoconnor]

The first automated fast food sales outlets ("automats") appeared in the 1890s in Germany. They became very popular for a while. In the US the last ones (Horn and Hardart) went into a deep decline in the 60s and had mostly disappeared by the 1970s.

[Broken_Hippo]

Some of those weren't really automated, but rather worked more like vending machines. Weirdly, I've seen an updated version of these in hospitals. In addition, I've seen vending machines with cafeteria sandwiches and frozen microwave dinners.

For clarity, what I more refer to is kitchens without human intervention save for mechanics. The machines make burgers, fries, and whatnot. It seems the first wave is going more to replace the cashier, though: McDonalds has introduced touch-screen ordering stations and grocery stores have self-checkouts.

[crdoconnor]

Why do you think we had a first wave from 1890-1970 and then again from 2017- ?

[Broken_Hippo]

Automobiles.