Which of these influential product design innovations was introduced first to consumers?

Product design has transformed our world through innovative solutions to everyday problems. Some design breakthroughs become so integrated into our lives that we forget they were once revolutionary inventions. Test your knowledge of significant product design innovations that changed industries and consumer behavior forever. Can you identify which groundbreaking design concept came first?

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The pull-tab can opener (ring pull) for beverage cans
The Post-it Note with repositionable adhesive
The computer mouse with graphical user interface
The Walkman portable cassette player