Which revolutionary packaging invention, patented in 1952, transformed retail by enabling self-service shopping and is credited with boosting impulse purchases by over 300%?

The world of retail has been transformed by countless innovations in packaging design. These inventions have not only changed how products are presented and preserved, but have revolutionized consumer behavior and retail logistics. This trivia question focuses on a groundbreaking packaging invention that fundamentally altered the retail landscape and remains influential today. Test your knowledge of this significant discovery that bridges product design, consumer psychology, and retail strategy!

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The blister pack (clear plastic packaging sealed to cardboard)
The aerosol spray can with valve-seal technology
The clear cellophane window on product boxes
The resealable pressure-sensitive adhesive strip (the 'Peel N Seal' technology)