What product had the first upc bar code stamped on it?

The first product to have a bar code scanned was a pack of Wrigley's Juicy Fruit Gum.

It happened on June 26, 1974. The pack of gum and the sales receipt are in the Smithsonian Institution.
It was a 10-pack of Wrigley's Juicy Fruit sold in 1974. It was in Marsh's grocery store. The barcode scanner was built by NCR.
Wrigleys Chewing Gum it was on a quiz at school