Which retail technology was first developed by NCR employee David Collins in 1951, but didn't become widely adopted in stores until the 1970s?

The retail landscape has been transformed by numerous technological innovations over the decades. Some inventions that we now take for granted were once revolutionary breakthroughs that fundamentally changed how consumers shop. This trivia question focuses on a pivotal retail technology that altered customer experiences forever. Test your knowledge about the origins of retail innovations that shaped modern shopping habits!

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Barcode scanning system
Electronic point-of-sale terminal
Self-checkout kiosk
Contactless payment system