Which packaging innovation was first patented in 1952, but wasn't widely adopted by retail stores until the 1970s, eventually revolutionizing inventory management and checkout efficiency?

Product packaging has evolved dramatically over the centuries, with certain inventions revolutionizing how goods are preserved, transported, and marketed. Beyond mere protection, innovative packaging has shaped consumer behavior, reduced waste, and created entirely new industries. This trivia question focuses on a packaging breakthrough that transformed retail and continues to influence our shopping habits today.

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The UPC barcode system
Resealable ziplock technology
Tetrapak aseptic packaging
Blister packaging