Which packaging innovation, patented in 1952, revolutionized retail by dramatically extending product shelf life and enabling self-service shopping models?

Product packaging has evolved dramatically throughout history, with certain innovations revolutionizing how goods are preserved, transported, and marketed. Some packaging inventions were so groundbreaking they transformed entire industries and consumer behaviors. This trivia question focuses on a packaging breakthrough that fundamentally changed retail by enabling new distribution models, enhancing product preservation, and transforming the shopping experience.

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