[Answer] What fast-food chain was the first to offer full drive-thru service?

Step 1 : Introduction to the question "What fast-food chain was the first to offer full drive-thru service?"

...When Harry and Esther Snyder, the original owners of In-N-Out Burger, began using a two-way intercom in 1948, they revolutionized fast-food service by creating the world’s first drive-thru-only restaurant. Drive-in restaurants had existed since at least the early 1920s, but In-N-Out was the first known restaurant to offer neither indoor seating nor outdoor parking. In fact, the company was entirely drive-thru-only until cities began refusing to allow new restaurant locations due to traffic jams. The restaurants finally added seating. Through it all, the company has remained family-owned, and is today run by Esther and Harry’s granddaughter.

Step 2 : Answer to the question "What fast-food chain was the first to offer full drive-thru service?"

In-N-Out Burger:

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