Which of these revolutionary inventions had the longest gap between its initial creation and widespread commercial adoption?

Throughout history, groundbreaking inventions have often traveled complex journeys from initial discovery to widespread adoption. Many products we use daily were invented years or even decades before becoming commercially successful. This poll tests your knowledge of product development history and the gap between invention and market recognition. Can you identify which famous invention took the longest path from creation to commercial success?

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Touch screen technology (invented 1965, mainstream adoption in smartphones around 2007)
Bluetooth technology (invented 1994, widespread adoption in consumer devices by 2004)
Digital camera (invented 1975, mainstream consumer adoption by 1999)
QR codes (invented 1994, gained widespread commercial use by 2010)