Which retail technology innovation dramatically transformed the ice cream industry in the 1920s and led to the widespread availability of ice cream in grocery stores?

In the competitive world of frozen desserts, food retailers and manufacturers constantly innovate with technology to create better products and shopping experiences. This trivia question explores a fascinating retail technology breakthrough that revolutionized how we enjoy one of America's favorite treats. Test your knowledge about the intersection of food retail history and technological innovation!

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Continuous freezer technology that allowed mass production of ice cream
Self-service refrigerated display cases for grocery stores
Automated ice cream vending machines in retail locations
Thermal packaging technology that enabled home delivery services